I have spent few years in gambling as total period but never gave more than 3 hours in any single day to gambling. That was when i was playing roulette and slots machines because they need time and attention to play. In sports betting and I just choose option place bet and let it work by itself and I enjoy the games.
You must be very much determined with your gambling plans. Gambling only for few hours must be a good practice as you will not keep on trying again and again with your profits. Usually, I do gamble till I face losses. Most of the time, my accounts got thrown away in one or two hours of play itself based on my bank roll.
That's right because the longer we gamble the more our chances of winning will be lesser, if you are just interested to make money and just wanna try your luck, I think that best way to do so you will no longer waste your time anymore is just to bet all in. That way, you know directly the result and you will not addicted.