I've heard of some women who get so turned on that they have "mind orgasms" meaning you don't even need to touch them.
My ex. could cum within a few seconds when she was really turned on.
The speed of the orgasm depends on the mind, like men who experience premature ejaculation, there are women who react with similar speed.
I started a thread about the difficulties of lasting with full balls, if you can't hold back just enjoy your own pleasure then continue her pleasure with oral sex until your cock recovers, then not only will she be more turned on and closer to orgasm but you won't have such an immediate desire to cum when you start fucking again.
If you want to make a woman orgasm as quickly as possible, target her orgasm trigger points: Clitoris, g-spot, epicenter and AFE zone with your tongue, fingers, penis or sex toy.
Search this site or do some research on google if you don't know where to find those points.