I had just finished my shower this morning and DH said he was having a quick shower. I stayed in the bathroom getting dressed and he was showered and dry before I had finished, so maybe four or five minutes. He is very efficient, wet everywhere, soap everywhere, rinse.
DS announced he's having a 'quick shower' before his friends come over, he's still in there nearly 30 mins later. His friends have arrived and have been playing on the Xbox for nearly 20 mins. 