Most females I have been with seem to get off relatively quickly... But I think this is more complex than it seems, sadly not due to my superior skill or equipment. They will pulsate for minutes, even after you separate and try again. This likely relates to tying/knotting, where they will be locked together in a more subtle bliss than humans are used to.
For example, my boxer female would hump me to orgasm multiple times in one session, and although she seemed to reach multiple orgasms, she would continue to pulsate for at least 15 minutes, if I could last that long. I would often try to stay "tied" with her, and even feel asleep together a few times.