I think that question has too many variables. The fact is, if a girl knows how to suck it right then I might blow in 2 minutes. If she doesn't know what she is doing, or maybe just doesn't know me, it can take hours.
Maybe we should approach this scientifically. We set a control, in this case a girl willing to give a lot of head in a uniform way, and let the different men be the variables.
I volunteer to be a variable
