I'm the exact opposite, if she asks me how long I want it shows she hasn't got a clue which punter I am so won't recall any discussions about services we've had.
If I book an hour at 2 pm she should know who I am and how long I booked when I turn up 2 pm. Her not knowing would make me suspect I didn't book directly with her and she could be pimped, and not in a good way.
Agree, any SP who doesn't know who you are and how long you're staying by the time she opens the door to you isn't managing/being managed well.
If she asks "how long" then she's not bothered about who's coming after. So all you pissed off punters dawdling and loitering out on the street or in cafes, cars and doorways are the victims of this shoddy practice.
The best punts are from SPs who greet you like they want you there and don't fancy you leaving either, kisses or welcoming hugs that show genuine warmth and enthusiasm are good indicators as are cheeky grabs of butt and urgent caressing of your swelling knob to make it harder; aggressive grabbing isn't so good as she may be tactlessly rushing you. They don't have to speak English well but they make an attempt to say friendly, flirtatious things; not barks about money or time. They give you the eye and lick of lip that signals a woman hungry to fuck. If she's already servicing you before you reach the bed or sofa then odds are on you're going to do well if you play your cards right, because things could still turn if she has a ploy.
Enjoy but be wary. If she breaks the momentum to ask for money then confirm all services before handing over the dosh. Be prepared to exit if she's not vibing with what you're after, better to put your money in a welcoming slot 30 mins later rather than a resentful piggy now.