My understanding is that serious alcoholics are drunks for days at a time. They go to bed with enough alcohol in their system to be drunk when they wake up, an

My understanding is that serious alcoholics are drunks for days at a time. They go to bed with enough alcohol in their system to be drunk when they wake up, and they keep drinking throughout the day. Having zero alcohol in their system can be life threatening. That means they can build up to whatever BAC slowly.