You're Coming or NOT!! How long should guests have to RSVP for weddings? Ideally, the RSVP date should fall three to four weeks before the wedding, and the wedding invitation should be mailed six to eight weeks prior to the wedding.
This way, it's close enough that your guests feel like they can't put it off, yet it's not so close that they've made other plans.
Choose the Right Wording:
Oftentimes, guests don't really know what RSVP means, nor do they understand that a response is needed, even if they are declining the invitation.
Using wording such as, 'The favor of your reply is requested by [insert date]' in place of 'RSVP' makes it crystal clear. - 6 minutes ago