There's a few factors for me in my limits.
Very rarely I'll pay max 150 quid per hour but she's got to be fit, great reputation, extensive likes list, everything included. An 150 quid per hour lass has to leave my head spinning, anything less than a spinning head and wobbly legs is poor vfm at that rate imo.
120 per hour is realistically my max, if anything is charged extra on that then I don't partake in the extra.
Some charge up to 160 on the hour, I won't hand that kind of money over, I'll book 45 minutes max.
But BP, to answer your question, for a complete newbie with no recommendation, feedback, reviews then it's half an hour on her flat rate and no extras, if she's great then I can always return. I rarely extend bookings as I only ever take the exact money.
What aggravates me is the new lasses that want to charge big big money without building a reputation, kind of like not serving an apprenticeship, they're the ones that are highly unlikely to see me. The money I hand over took hard graft on my part to earn, it needs earning on its second journey too.
My much much favoured rate is 100 on hour, if they're good then these lasses are likely to see me regularly.