proof by recess:

• As we will prove after the break.
• Riing
• Before the break we proved that…

Well, in cologne the beer is usually served in 2dl glasses. so 37 of this equals to 7.4 liters. if you arrive at the bar after work at 18:00 and leave at a reasonable 01:00 in the morning, this is arround a liter per hour. Definitely doable, but not recommended to do regularly.