I think you can have it as quickly (or slowly) after your DW as you want! You might want to do it quickly if you don't want to drag out the "I'm getting married" for months and have your family and friends get sick of you I am getting married in Cancun 2/19/11 and having the AHR 3 weeks after. We wanted it even sooner, but realized we would need time to harass people for rsvps, do the seating chart etc and didn't want to feel stressed.