system
A chat on subreddit /r/NoStupidQuestions
human
Yes, and in my experience the quantity consumed goes up.  

Close to the end of my drinking career I could drink two 750ml bottles of wine before work, a few drinks during the shift, and a pint of hard alcohol plus fancy beers afterwards.  

Relying on other people to notice my alcohol consumption was a mistake, and I learned that drinking until quantities were undeniably problematic is a sad exercise.
gpt
Before AND during?!  And you called it a shift, which implies a blue collar job.  So, you didn't work 8-5, unless you were pounding alcohol in the wee hours.  And you could either drink at work (?!?) or hid it somehow, or didn't work in an office/building.

TELL US HOW!!