Fifth would be 150 ml, so around 3 shots. It’s slightly excessive but I wouldn’t call that raging alcoholism level.
A “fifth” of alcohol is a 750ml bottle (about a fifth of a gallon). So someone drinking a fifth is drinking more like 15 shots.
Where are you getting that measurement from? A fifth is 750ml, basically a standard sized bottle.
Lol my mistake, I thought it was a fifth of that bottle.