In my case I'm 4" and I last maximum 5 minutes (in the best scenario!)
Durian weekend I had a cuckold experience, I heard my gf fucking with one hung guy. The sex was almost 2 hours, but I heard clearly 45 minutes of hard pounding. My gf never cum with me, and I clearly heard her cum 12 times minimum. It was difficult for me to difference if she cumed more times because of her moaning. But the count was every time I heard her "I cum again!"
So from my experience. Yes... big dicks last much more than small ones
Durian weekend I had a cuckold experience, I heard my gf fucking with one hung guy. The sex was almost 2 hours, but I heard clearly 45 minutes of hard pounding. My gf never cum with me, and I clearly heard her cum 12 times minimum. It was difficult for me to difference if she cumed more times because of her moaning. But the count was every time I heard her "I cum again!"
So from my experience. Yes... big dicks last much more than small ones