For me it depends a lot on how often I fuck or masturbate.
Some times it takes forever and I need to finish with HJ or BJ, because the time is up.
Once or twice I had to go without cumming, which is annoying but if it has been an hour and cant happen...
And once I came so little that it was actually painful, and minuscule, with Aleisha...
So faking it maybe had been a better idea. But again, how am I going to bray like a jackass if I am not cumming?