A short masturbation duration does not necessarily mean that the duration of sex will be longer. The length of both activities is influenced by various factors, such as individual libido, stamina, physical condition, emotional state, and more. While some people may use shorter masturbation sessions to train control and extend their time during sex, this is not a universal rule.
Overall, sex and masturbation are different experiences involving emotional interaction and physical contact, so the duration of sex depends on many physical and psychological factors, not just the time spent on masturbation.