it depends.
Usually between 0 and 5 times per week I'll have 1+ beers in one night. (over the last 52 weeks, I'm probably at an average of about 2 nights per week)
Usually between 0 and 2 times per month, I'll have 5+ drinks in one night.
Usually between 0 and 6 times per year, I'll have 15+ drinks in one night.
That being said, I have been at friends houses and consumed 15+ drinks over a course of 12+ hours never to get drunk, and I have been at parties where the first 7 or 8 drinks are all consumed in the first hour.
It's much more a matter of how much over what period of time than anything else.