How long do you call for contained by bed since you arrive at org*sm?

I'm just curious what the feminine average is, at the moment i normally walk for 15-20 mins of foreplay and 5-12 minutes full s*x. Is that enough? Depends on how appropriate the guy is at talking me showery, foreplay and what he does with his appendage or if he's leaving it up to me.
It vary - if I am even lucky enough to procure too.