If a leisurely dinner with drinks lasts as much as 1½ – 2 hours and you have served alcohol in the equivalent of 2 bottles of wine to a table of 4 guests, your guests are approaching or have already met their alcohol limit.
So beware!
If you haven’t taken your course in Responsible Alcohol Serving recently, you may want to refresh with the following PDF file:
Responsible Service of Alcohol: A Server’s Guide
If they mix spirits or beer with their wine I have to add that — right?