Well, I'm 29 now, and down to once a week. If I'm drinking, it'll be Saturday nights. I drink most Sat nights, but if I've got anything important on Sunday, I won't.
Though, I was never that big of a drinker. Never drank very much until I was 21. Even then, I think 4 nights in a row was the most I ever did, and that was once (Fri-Mon on a Memorial Day weekend). I use to drink Fri and Sat nights, but that was a bit too much, so I cut it back to just Sat nights.