A lot of it just depends on what I am drinking. If it is captain and coke, I can probably have about five or six before I start to feel anything. Beer probably gets me a little quicker, but it depends on what kind of beer I am drinking. Some of them have a much higher ABV than other ones. Straight whiskey or bourbon I can maybe drink a half a fifth before I have a hangover. I was at a birthday party one time and someone joked you could tell it was a birthday party for someone that had just turned 40 because everyone had a drink in one hand and a glass of water in the other. Staying hydrated is key!