Depends. I had nights in college where I drank until 1-2, then resorted to other things for a time, then went back to drinking around 6 or 7am and drank through the afternoon until my body finally gave out. My college campus also hosted a carnival-style day on a random Friday called "Fun Day" where everyone gets trashed and goes to it. It starts at noon though, so to be certain we were all in good shape for the beginning of the festivities, I dragged everyone in my house out of bed at 8am with an open beer. Survived until 5pm or so before passing out.