HI Charlie,
It may be right most of the time.
However I know there was a very popular ML in Newtown 501, who was the master of massage.
She always has good attitude, good service.
I never heard one brother say anything bad about her.
She can manage 14 x FS customers plus those just went for massage + HJ.
Of course most of them are 30 minutes customer.
She already retired.