Short period of playing but 5 hours a day, or log period of playing 1-2 hours on day?

long period 5 hours a day

5 hours

Until you feel tired and you see lack of skill in your game!

between 5 and 7h a day

This is the wrong answer! No one has played so long, it just does not leave time for personal life! This is just a sport (hobby), it is not should not obscure the real life!
I propose to play no more than 7 hours a day!