Law of Urination: all mammals empty their bladders over the same duration

21 seconds.  So ask your neurologist why that damned urge to pee fires so easily. And due to normal male aging and prostate stuff I spend at least 21 seconds after I'm done making sure those last dribbles are done.

A great writeup on this blog here;

The Law of Urination Revealed

The abstract this is all based on here;

Law of Urination: all mammals empty their bladders over the same duration