At the request of the Committee on Rules and Practice of the Judicial Conference of the. A party may serve on any other party no more than 25 written interrogatories, including all discrete subparts.If personally served, responses to interrogatories are due within thirty (30) days of service. NCLC's Fair Debt Collection treatises discusses discovery issues that have been addressed in fair debt collection opinions. Orders is not in the federal rule. Interrogatories must be served on the party from whom responses are sought and all other parties who have appeared in the action. Rule 33 of the Federal Rules of Civil Procedure covers interrogatories in detail. Federal Rule 33 limits interrogatories to twentyfive per party rather than per side. This subdivision (m) does not apply to service in a foreign country under. Rule 4(f), 4(h)(2), or 4(j)(1), or to service of a notice under Rule 71.1(d)(3)(A).