How long should a reception be?

Hey, I am getting married on a Friday afternoon with about 80 guests. The ceremony starting at 11:30 am and ending about 12:15 at the latest. (I want a short ceremony). We're having appetizers and a photobooth available to guests as we take the next hour to take pictures. We plan to finish with pictures by about 1:20 and begin eating at 1:30. We are not having alcohol, the food is buffet style, and we don't plan on cutting a cake but doing cupcakes instead. There will be music playing and we may do a first dance. I want to leave the venue by 3:30 ish. Is that too early? I could buy more time, but I don't want it to be dragging on. I want people to still be able to enjoy their Friday nights and relax. (We aren't party people so nobody will care about the lack of dancing or anything).