According to a 2008 survey of sex therapists, sex is “too short” when it lasts one to two minutes. “Adequate” is three to seven minutes, and “desirable” is seven to 13. The range for “too long” went up to 30 minutes.Anything longer, like “more than 40, ” will henceforth be known as “too Kanye.”.ccording to a 2008 survey of sex therapists, sex is “too short” when it lasts one to two minutes. “Adequate” is three to seven minutes, and “desirable” is seven to 13. The range for “too long” went up to 30 minutes. Anything longer, like “more than 40, ” will henceforth be known as “too Kanye.”.