This will achieve the opposite effect of what you want.
Aim for at least 3 sets of 10 repetitions per day.
TIP: If both you and your partner are doing Kegel, both of you can do Kegel while having sex.
Doing the exercises right trumps doing a bunch of them incorrectly.
Now, you must try and increase the duration of clench from one of two seconds to 5 or 7 seconds.
When you are in the verge of ejaculation that will be the time when you need to stop it and delay so that your partner can get another round of love making chance.