Discovery in a lawsuit usually runs anywhere from three months in a straightforward case to a year or more in complex litigation, and in the largest cases it can stretch past two years. No single rule sets a universal length. The judge assigns a case-specific timeline in a scheduling order, and how closely the case sticks to that order depends on the volume of evidence, the number of parties, and how well the lawyers cooperate.
Typical Discovery Timelines by Case Type
No federal rule fixes a universal discovery period, but patterns hold up well across case types:
- Simple cases, such as a single-incident personal injury claim or a straightforward contract dispute, often wrap up discovery in three to six months. Limited documents, few depositions, and no significant electronic discovery keep things moving.
- Moderately complex cases, including employment discrimination, professional malpractice, and insurance disputes, typically run six to twelve months. Expert witnesses, larger document sets, and more depositions fill the added time.
- Highly complex cases, such as multi-party commercial litigation, antitrust, securities fraud, and mass tort, routinely take one to two years or longer. Massive e-discovery, dozens of depositions, multiple expert disciplines, and frequent disputes over privilege and proportionality drive the timeline.
Federal courts tend to enforce their scheduling orders more strictly than many state courts, so federal discovery periods often stay closer to the original timeline. State practices vary widely: some jurisdictions set generous default discovery periods and others leave the timeline almost entirely to the parties.
What Sets the Clock
Discovery does not start the day the lawsuit is filed. The federal rules require the parties’ attorneys to hold a “meet and confer” conference to discuss a discovery plan at least 21 days before the judge holds a scheduling conference or issues a scheduling order.1Legal Information Institute. Federal Rules of Civil Procedure Rule 26 – Duty to Disclose; General Provisions Governing Discovery They talk through scope, propose a timeline, address electronic data, and submit their plan to the court.
The judge then issues a scheduling order, which is where the actual deadlines live. Federal judges must issue this order within the earlier of 90 days after any defendant has been served or 60 days after any defendant has appeared.2Legal Information Institute. Federal Rules of Civil Procedure Rule 16 – Pretrial Conferences; Scheduling; Management It sets firm dates to complete discovery, file motions, and disclose experts. Once entered, those dates govern the case unless the judge agrees to change them.
Within 14 days after the meet-and-confer conference, each side must hand over initial disclosures without being asked: witnesses with relevant knowledge, supporting documents, a damages computation, and any insurance policy that might cover the judgment.1Legal Information Institute. Federal Rules of Civil Procedure Rule 26 – Duty to Disclose; General Provisions Governing Discovery That automatic exchange shapes the formal discovery that follows.
The Tools That Fill the Months
Even a “simple” case needs several months because each discovery tool carries its own clock, and the tools have to run in sequence more often than in parallel.
Interrogatories are written questions answered under oath. Each side is limited to 25, including subparts, unless the court grants more.3United States Court of International Trade. Federal Rules of Civil Procedure Rule 33 – Interrogatories to Parties The responding party has 30 days to answer. In practice, attorneys often negotiate extensions, and objections over vague or overbroad questions extend things further.
Requests for production demand documents, electronically stored information, or access to physical items, again with a 30-day response window.4Legal Information Institute. Federal Rules of Civil Procedure Rule 34 – Producing Documents, Electronically Stored Information, and Tangible Things, or Entering onto Land, for Inspection and Other Purposes In document-light disputes, this can wrap in a few weeks. In cases involving years of corporate email and internal databases, collecting and reviewing that data alone can take months.
Requests for admission ask the other side to admit or deny specific facts. The 30-day deadline carries a bite: anything not answered on time is automatically deemed admitted.5Legal Information Institute. Federal Rules of Civil Procedure Rule 36 – Requests for Admission
Depositions are live sworn questioning outside the courtroom. Each side is limited to 10 depositions, and each is capped at one day of seven hours, unless the court allows more.6Legal Information Institute. Federal Rules of Civil Procedure Rule 30 – Depositions by Oral Examination They are usually the slowest and most expensive part of discovery. Coordinating attorneys, witnesses, and a court reporter often takes weeks per deposition. In a case with 10 or more depositions per side, this phase alone can stretch across several months.
Expert Discovery Runs on Its Own Schedule
Expert witnesses often extend the timeline well past the close of fact discovery. Unless the court sets a different schedule, each side must disclose its expert reports at least 90 days before trial, and rebuttal experts have an additional 30 days to respond after the other side’s disclosure.1Legal Information Institute. Federal Rules of Civil Procedure Rule 26 – Duty to Disclose; General Provisions Governing Discovery
After reports are exchanged, each side typically deposes the other’s experts. Specialists in fields like economics, medicine, and forensic accounting often have limited availability. In complex cases with competing experts, this phase can add two to four months on top of fact discovery.
What Pushes the Timeline Past the Deadline
The scheduling order sets a target. Several forces routinely push the real timeline past it.
Case Complexity and Evidence Volume
A fender-bender with a police report and one set of medical records is a different animal than a commercial fraud case spanning five years of financial transactions across multiple entities. When a case involves millions of electronic files, collecting, filtering, reviewing, and producing that data can dominate the schedule. Large e-discovery projects often require specialized vendors and technology-assisted review, and review alone can take months.
Number of Parties and Witnesses
A two-party case with a handful of witnesses is manageable. A multi-defendant case with cross-claims, third-party subpoenas, and dozens of potential deponents becomes a scheduling problem in its own right. Each additional party may send its own interrogatories and document requests, and every deposition has to be coordinated with more calendars.
Attorney Cooperation
This is where most timelines quietly fall apart. Cooperative attorneys agree to reasonable extensions, resolve objections informally, and trade documents without drama. When the relationship is adversarial, lawyers serve overbroad requests, respond with boilerplate objections, and push every minor disagreement into a court filing. Each dispute eats weeks.
Motions to Compel and Protective Orders
When one side believes the other is withholding information, it can file a motion to compel. Before filing, the moving party must certify a good-faith attempt to resolve the dispute without the court.7Legal Information Institute. Federal Rules of Civil Procedure Rule 37 – Failure to Make Disclosures or to Cooperate in Discovery; Sanctions Once filed, both sides brief the issue, the judge may hold a hearing, and weeks or months pass before a ruling.
A party facing what it considers abusive or burdensome requests can seek a protective order to limit or block the discovery.8United States District Court for the Northern District of Illinois. Federal Rules of Civil Procedure Rule 26 – General Provisions Regarding Discovery; Duty of Disclosure One common misconception: filing that motion does not automatically pause the disputed discovery. Unless the judge issues a stay, the party still has to comply while the motion is pending. Either way, the briefing and decision add the same kind of drag as a motion to compel.
Can the Deadline Be Extended?
When attorneys realize they cannot meet the scheduling order’s discovery cutoff, they must ask the court for a modification. The standard is “good cause,” and the judge has sole discretion over whether to grant it.2Legal Information Institute. Federal Rules of Civil Procedure Rule 16 – Pretrial Conferences; Scheduling; Management Good cause means showing that despite diligent effort, circumstances beyond the party’s control prevented timely completion. Late-identified witnesses, unexpected document volumes from third parties, and health emergencies tend to meet that bar. Poor planning does not.
Judges weigh extensions against the federal rules’ goal of a “just, speedy, and inexpensive determination of every action.”9Legal Information Institute. Federal Rules of Civil Procedure Rule 1 – Scope and Purpose First-time requests with real justification are often granted. Repeated requests meet increasing skepticism, especially when the delay traces back to one party’s tactics.
What Happens if Someone Misses a Deadline
Discovery is not optional. If a party disobeys a court order to produce documents or answer questions, the judge can impose escalating sanctions under Rule 37. The court can treat disputed facts as established, exclude evidence, strike pleadings, dismiss the case, enter a default judgment, hold the party in contempt, and order payment of the other side’s attorney’s fees.7Legal Information Institute. Federal Rules of Civil Procedure Rule 37 – Failure to Make Disclosures or to Cooperate in Discovery; Sanctions Destroyed electronic evidence carries the harshest consequences: if the loss was intentional, the court can instruct the jury to presume the missing material was unfavorable, or dismiss the case outright.
A quieter but equally damaging rule applies to disclosure failures: if you did not properly identify a witness or piece of information, you cannot use it at trial. Cases turn on this. If your key expert was never properly disclosed, the jury will never hear from them, and that risk is one of the strongest reasons attorneys try to stay inside the scheduling order rather than gamble on an extension.