Today in science explained by Tim F, a breaking study in Proceedings of the National Academy of Sciences.
[A]ll mammals above 3 kg in weight empty their bladders over nearly constant duration of 21 ± 13 s.
They went to a zoo and watched animals piss. It takes the same time because larger mammals have larger urethras, more help from gravity and less viscosity to slow down flow.
This has been another edition of science explained by Tim F.
If you see an impossible headline in an original research journal that you want to see me [attempt to] explain with simple words and inappropriate analogies, feel free to email me. There is a non-zero chance that I might give it a try.