I never had hangovers nor forgot the night before when I used to drink at uni.
A typical amount that I would have drank in one night out would have been 16-20+ alcopops (quickly learned that these were vile and too expensive), or 6 x double Vodkas or JDs with Red Bull / Coke.
I always stopped at 6 doubles of that stuff, thats what it took to get myself completely wrecked so I assumed that amount was right.
At the worst I threw up the following morning, and then I was fine. I could still spend 45 minutes walking back to the campus along the main roads too without falling over or any significant issues.