I know the question was directed towards women, but, as a guy, a handjob would take longer than quickie sex, women just usually don’t know what they’re doing. It’s the same way it probably wouldn’t be helpful for a guy to try to rub a woman’s pussy to get her off, we just don’t know what feels good for you as much as you know your own body. You may as well just ask me to jerk myself off while you rub my balls than try a “quick” handjob, unless you’re an expert at it. May depend on the guy though, mileage may vary.