How many minutes should be spent on writing out rules + making rule inferences?

I typically spend 2 minutes reading the rules and writing them out. And by the time I am finished with inference making 4-5 minutes has gone by. But I do finish most of the games within 8 minutes. I just don't know if I am spending too much time on rules & inferences.

Powerscore says 5 minutes is good for rules + inferences

Testmasters said 8 minutes rules + inferences because questions will go by within seconds when you have the whole picture in front of you.

7sage, well J.Y is a genuis. He typically says "this is an easy game so it should be done under 5 minutes."

Soooo confused