When I am bored and have the extra BTC or cash available, I will play about 4 hours in any given day. Because of my limits to funding, I can not play as much as I would like to. When I get into the dice though, I always seem to want to play more and more. I have a hard time stopping!
Playing 4 hours is already too long. You can accomplish a lot already with that amount of time. And what do you get from that? I am guessing, mostly nothing. Most of the time, the house wins especially if you play too long. So those 4 hours are wasted time. I think you need to get a new hobby that is worthwhile than just spinning dice. You can get addicted too.