This is a new form of break in the workforce. It is meant to be a 15 minute break in which workers go to the nearest bar and have a drink of their choice. It originated when a faction of non-smokers grew jealous of smoker who get to go outside for a 15 minute smoke break. This faction would go across the street to a bar with the intention of doing a shot. Eventually, the shot became just the drink of choice.
The 1 beer 15 minutes theory is often tested.