It can also be explained mathematically. Let the first bar represented by A, and the final destination by B. There are 5 bars between A and B, you have to hit up each bar within a period of now until 2 am. So to solve this equation, you have to know the variable x, which represents how much fun you want to have.
Everyone in the room: Yeah!
ITT: No one really cares where you're going, or how you're getting there. We just want beer!