This question is not a valid question to begin with. I respect the fact that you probably want to make her feel good so you feel more confident in your abilities but honestly there is no girl who can cum according to a timer. Also a girl is not going to cum with each partner she sleeps with. Be patient in your approach, explore her body and slowly learn your way to please her.
Not a criticism of your response in any way but just a comment.
Many women may not grasp this as men are so often portrayed as having weak egos and needing evidence of their stature or prowess to compensate for this. Contrary to this, I believe, myself and, I suspect, many men don't long for women to orgasm when we're with them for any other reason than the simple fact that there is just nothing more beautiful in the world than a woman in the throes of genuine passion.
Take an attractive woman and please her sexually and you are suddenly in the presence of female beauty personified. There's really nothing else like it in the universe. Time (and money) well spent when ya find the right lady
