My husband usually comes in 5-10 min when I suck his cock. He can fuck for hours though so it's great...when he's ready to unload or I'm getting too tired to fuck anymore, I just go down on him. It's usually just a few minutes if we've been fucking first.
depends on the womans ability to suck good dick...for me its hard to come from a blowjob alone, except i am ultrahorny and with a hot chick, I guess i`m just too desensitized (is that how u say it?)