Is there a point to this thread, or do you just want to know if that's a lot to drink?
Yes, that's a lot for one person to drink, and he probably left because you were out of beer.
Pretty much. I don't drink much. I grew up around people who drank a lot but it was more or less when we were younger and it was partying, etc. Now that I'm 30+ I look at that differently. For someone 30+, with no life and no money, it seems a bit much to be going through a 12 pack in a few hours on a weeknight for no big reason.