For me, the big difference isn't the time itself, but that a guy (or woman) can keep going with oral and I can let it run, if we have the time, and enjoy being licked (either before or after fucking) for quite a while before I orgasm. When were fucking, I know that once he ejaculates it's over for a while. So I've become adept at being able to speed up my cumming to beat or match his (position - missionary, cowgirl, doggy - matters too, for both me and him). If he does cum first, if I'm close and he stays in me I can occasionally orgasm on a soft dick before it slips out. I like sucking a sloppy used dick, so sometimes that will get him back up (something I especially like in the context of FMF, where I'm going second with him and I get excited by tasting their mixed juices). Or, he can go down on me while he's recovering.
In my situation of only playing with three guys though, I have the advantage of knowing them well and how they work their way to orgasm.