Need advice for my Fantasy Football punishment

So I lost my fantasy football league last year and we are just getting around to doing my punishment now which is staying in a bar from open to close (15 hours). The bar I chose is only open 11 hours so must drink at least 4 hours worth of alcohol before I can get more time off.

It is 15 minutes a beer, 30 minutes a mixer, and 45 minutes a shot. If I want to get out in 8 hours is there a reasonable way to do it without getting blacked out? For reference I am 5’10” and 170 lbs. Need some advice!