I can probably give you some idea as I have enjoyed a number of personal relationships with W/L's.
It will depend on the type of service, ie dinner dates, in house, escorts, R&t's, quikkies, GFE's etc.
It will also depend on the day of week and shift, ie morning, afternoon, evening, night.
It will depend on time of year, what sport is on TV, when the US fleet is in port, which City, what competition etc.
Having said all that the range is between 2 and 8 per shift with the day shift average being around 3 clients and the night shift average being around 4 clients.
There are exceptions and I know some working ladies who may average 8 clients in a week and others that average 50 clients in a week.
Shifts vary from 8 hours to 12 hours.
The best sex I have ever had is with a W/L who has just finished work, where she has held off having an orgasm,.... and melts into the arms of a man she really cares for ....and says.... "please fuk me now and fuk me hard... I need an orgasm so bad... get your cock as deep inside me as you can and don't stop until I cum..... "