The interrogatories are sent directly to the other party and not to the court. A party may serve on any other party no more than 25 written interrogatories, including all discrete subparts.You have 30 days to respond to interrogatories, but you may ask the other party for more time. Whether you are the plaintiff or the defendant, questions from the opposing party, called "interrogatories," must be answered within 30 days. Plaintiff. Such direction, application, or stipulation must be served on all parties to the action and filed with proof of service. Appeal From Partial Final Judgment in Multi-Party Cases. (e) Service and Filing. Limits You can send up to 15 interrogatories to another party in the lawsuit.