It depends on the situation. If he comes home my wife will make him cum whenever he wants it. She normally stops short of it, kisses him, relax, fuck, and then if he wants it, she gives him head again and makes him cum in 2 min. In a club, it's different. There is 60% of the time just blowjobs. She lets them finger her first, shows them her tits, and only then puts their cock in her mouth. She reads their face and if he says slowly she slows down. But she would mostly let them cum within 7-10min. Once she had 3 cocks at once and managed to suck dry 2 of them in 3-4min, the other one took a bit longer. Her technique doesn;t fail.