In the past few years, I only chose 1 BNG date. Usually I like to schedule at leasty an hour, or two.
It lasted about 15 minutes, for a reasonable rate, and she stayed clothed, but opened her shirt enough for a good peak

She was fairly unknown in an area that isn't easy to hobby in, so I was reluctant to meet for anything more at first. Now, she is well known out there!
The next day I spent 2 hours with her.
BNG to me is just a bbbj, quick and simple. Her nudity is appreciated, but not required! As others stated, if you know the rules upfront, everyone will be satisfied when it is over.