There's no definite length of time or number of experiences it takes. There are many tricks you can use, though. Some guys think of something to keep their mind off sex and it helps them last longer. Also, if you urinate before sex but stop the flow before you finish peeing, it makes it harder to climax.Why not try a shifting-perspective narrative? I have a novel coming out next year that is written in this style- approx 70 percent 1st person and 30 percent 3rd. It gave me more freedom because I didn't have to have my protagonist on every single page and every time I started to get bored with what I was writing I just shifted perspectives. I'm about 80 percent finsihed the follow-up, and I'm experimenting again with multiple perspectives. A lot of people say not to do the shifting-perspective stuff, but for me it is the only way to work.In my opinion, the last longer in bed problem can be treated by ejaculation training. Ejaculation training is a natural and safest way to have sex last longer with no pills, no creams, no condom and no erection bands. Here are good articles about the truth of premature ejaculation treatment naturally and success stories. It's very useful for you. Don't worry!