It depends on what type of shower I'm looking to take.
If its an "OHSHT They're gonna be here in 5 minutes and I look like a hobo!" shower, under 7 minutes.
If its an average weekday shower, 7-15.
If its a "oh god lets get rid of this body hair" shower, a little longer.
And if its one of those showers I take because I'm waiting for something to happen, but I got up at 6:00 and have another 5 hours until said event, as loooooooooooong as possible.
That said, I voted option 2, as its an average for me.