@afewbugs Here goes: 12 servings will have 120ml of rum and 60ml of coffee liqueur. Rum is appx. 40% and the the coffee 20%. So lets say that’s 150ml at 40%. So, that’s 12.5ml of alcohol per serving.
So many factors in getting drunk. Lets say it’s 5 shots of 40% alcohol??? All sorts of this affect that. A shot is about 40ml, so 200ml.
So, 200ml/12.5ml = 16 servings should do it! ;)