100% agree with this. 90 mins and you can get 3 sog. But they feel less rushed.
mathematically
If a 30 mins session has 2 showers and chit chat. You have about 20 mins of action
60 mins. Same time. But you have 50 mins left. Which means 25 mins per sog
90 mins. 80 mins of time. 27 mins per sog. After. That the math stays about the same.
you can also take a bit more time in between your shots