1. Figure out the deadline to serve your responses. You have 33 days from the date the.Each pafi is allowed to serve up to 40 Interrogatories -' including related sub-parts -- on another party. You may not serve more than 40 Interrogatories. Be sure to sign your responses. Fill in the "certificate of service" on the last page before mailing them back to the other side. The server must indicate the date served, the time of service and the actual address where the documents were served. Fill out a Request for Interrogatories. Provide a good mailing address or service address for the defendant. There is no specific number.