You would usually make the RSVP date 3-4 weeks before the wedding. Traditionally, invitations go out six to eight weeks before the wedding. This factors in enough time for them to post back RSVPs while giving you enough time to get the final head count to the venue or caterers and to finalise your seating chart. Expect as well some delayed RSVPs, so you may need to chase a few guests.
You may also want to check with your venue when the final meeting usually occurs as this can differ across venues. In this meeting, they are going to want an idea of final numbers and perhaps some additional information for the caterers.
If it’s a destination wedding, give guests more time and send your invitations out five months ahead of time and ask for RSVPs 7-8 weeks before the departure dates. Most couples also send out save the date cards when getting married abroad. They usually go out at six to eight months in advance and may include some travel info or a link to a wedding website. At Appleberry Atelier you can match your save the date to your invitation suite.