I've fallen asleep while receiving a BJ, and tend to get spacey -- it's just ... soooo ... re...LAXing ... mmm ...
As to women taking "too darn long" to get horny, maybe you're trying to get them in the mood starting at 10 pm. Good sex at 11 pm is generally assured by initiating a seething seduction at 10 *A*m. It's not the manual stimulation that was taking too long; it was all the rest.
At least, that's my suggestion. In my experience, when a girl's really "into" me, the whole "dangit when WILL she be ready" thing is JUST NOT AN ISSUE. But then again, maybe I'm irresistible and you're a fright.