Are these women chock-a-block for the whole 12+ hours, or are they doing long shifts because they’re quiet?

I’ve always wondered this, because I feel put off booking someone 10 hours into a 12 hour shift. I mean, how enthusiastic is she really going to be having you be the 10th middle aged fat guy crawling on top of her for the day.

If any of you bros have any insight I’d appreciate the input to quell my curiosity.