It really depends! Sometimes I barely last a minute, others much long. There’s various factors that can affect it too, like arousal, whether you’re tired and distracted. Things like that.
Yeah I agree with @Aunt_Flo and @NickiPower. There are so many things that can impact arousal, so I don’t think time matters all that much. Sometimes I need all the time in the world and other times just the thought turns me on 😉