I really think it's pointless to play those online games even for fun. You should try other games that'll help you relax and will give you benefits rather than playing computer games sitting for a long time which may give you a larger risk for heart diseases. You need to choose what'll benefit you plus what'll benefit or not harm your body. I am a gamer back then and I guess I have wasted a year of my life playing those stupid games which I really regret xD.

Try basketball or real soccer instead or any other things that will be more worth than playing with those silly games and if you still can't get off playing that games... you probably need to limit yourself 2 hours or less but still 2 hours could damage your system.