I was thinking about posting a similar comment the other day; I'm glad you did.
I had a masseur recently who delivered an awesome technical massage, and the sensual part was also great... he allowed for a lot of touching. When he asked me to turn over, he quickly moved towards the HE. I told him it'd happen pretty quickly, and indeed, it did.
I showered, and walked out of the apartment, before looking at my phone and realizing it was less than 40 minutes after arriving. I was suddenly irritated. On one hand, I wondered if I sent the wrong signal. Was I too frisky? Should I have been more clear to delay the HE? I ended up texting him about it, just to see if he'd reply, and of course, he didn't. All things being equal, I definitely would have returned to him before realizing the time deficiency; now I'm not sure.
I asked another masseur and his take was that after the HE, it's clean-up time and the massage part is generally finished. Granted, there are some situations that will compensate in other ways, but I am still confused how to handle this going forward.