Im not sure if my preferred experience matches other contributors to this thread but here are my thoughts
I see independents rather than parlours. From the first interaction, I can gauge how good the teasing HR is and whether the SP will be able to tease and edge for the whole session and whether the experience is likely to be enjoyable. If they are promising, I make a polite enquiry, saying how much I’ve enjoyed the teasing HR and explain that I love a proper long edging experience and whether the SP may be up for it in future sessions. Most usually say yes and many are curious about giving that kind of session because most haven’t been asked for it
I must also say that it may also depend on how you like to finish. If you need a firm jackhammering to ejaculate, expect a no because no one can sustain doing that for long. However, if you enjoy prolonged edging, it’s something which is usually given a thumbs up
I’ve also had some SPs who are prepared to do pure HR in the first session after a polite enquiry from me. I usually ask this of SPs who mention an expertise in edging or teasing in their ad, usually those with an interest in tantra and some femdoms
As always, courtesy gets you a long way