Just some scuttlebutt from a European pilot(not me). This pilot mentioned certain hotels(Glasgow) who have been known to ‘alert’ security at the airport when they have reason to believe a crew was having a few the evening before a flight. He said it was common knowledge to locally based crews.
As to how many & timing, no way to qualify that. I have heard somewhat similar in Mexico when hotel employees tried to extort $$ by threatening to call the company, alcohol, mid-layover.
Of course I wouldn’t in any way condone showing up ‘hung over’, or whatever. Just mentioning for awareness. It does sorta fit the template of some of these instances.