“We definitely don’t have a drinking problem” 😂
My first professional job had lots of client lunches etc with alcohol. The unofficial code was (in pints equiv):
1 pint = back to work as normal
2 pints = get on with admin, reading, drafting
3 pints = read the paper, basic personal admin
4 pints = go home, catch up tomorrow
You never work *drunk*, but there's often stuff you can get done, even if it's just prepping stuff, printing, pruning spam emails, typing up some notes. I reckon 'walk through the door the whip is pointing you at' is not deeply challenging as intellectual tasks go.
Key point is that you have to catch up - the workload doesn't go away, so you just have to work harder and longer the next day. In some jobs that's a viable trade you can make, in others, it isn't. If you want that flexibility, get a job where it is.