It depends on the mood I'm in.
If I'm feeling like I want some attention, I go for an hour or more with a regular I've got to know over the last 6 years or 7 years. She's amazing, knows how to press all my buttons and stimulates me with conversation as well as sex. I do my best to make her enjoy it too.
Then other times, I'm really up for the rush of in, fuck, out in 15 minutes or less. Those punts are all 100% me getting my rocks off as politely and quickly as possible. I make it clear beforehand that I want them to make me cum as quick as they can.
I guess it's like real life relationships. Sometimes you want a quickie, sometimes you want it to last ages. No right or wrong, just whatever takes your fancy at the time.