ERM. Mister stupid NPC. One does not simply "train" their drinking capacity. The only thing that can happen to "help" is you getting fatter/bulkier to last longer and also needing longer to recover. The only real thing that drinking so regularly willl result into is damaging your organs prematurely (especially the liver and the brain) and getting generally old faster. Without even considering the serious illnesses. Basically digging your grave.
Oh yeah, don't drink like those people do . That's a straight line to ethylic coma or straight up death. Your life is worth more than being a "hero" for 30-60 minutes.
The term "girlfriend" implies the existence of a "girlfoe". These are services I am willing to provide.