Tangent, but the 30-minute thing really depends on the provider. Of course, all else being equal, longer is better. But sometimes I have either time constraints and/or budget constraints, and I do enjoy the pu pu platter side of things, and if I can see 3 girls instead of 2 for the same budget, that's usually my preference. At weddings I always prefer the variety of the hors d'ouvres over the big serving of steak or fish. I feel like most of these veterans can pull off a lot in 30 minutes. Off the top of my head, I've had great first dates of 30 minutes with Tori, Shirley and Ivyna at PH, and Cindy at AD, who all managed to conjure up some semblance of a connection in that time. AD Bibi and AD Sammi were also pretty fun carnivals in my short stays last year. OTOH, last summer I saw that Ayaka girl and I did feel she's a girl you need to spend more time with. I stayed longer with PH Sara, but she's probably in that same category (even if she's a pro, she feels less pro). Honestly, I think Flora is more in the first camp - she's a total pro. If she's giving guys "instant connections" you don't need more than 30 minutes to create a connection with her. My Rachel-Joey combo, best session ever, was 15+15+15, so 30-minutes with each girl. (Though I already knew both of them, so that's different).
I also like the 45-minute option PH offers. Sometimes that's the sweet spot.