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Playing online gambling or traditional gambling in less than an hour is good especially for new people who want to feel the gambling games. I also use less than an hour as you, and I don't spend too much money because I know that playing gambling is forget fun although there is another activity that I can do to get the fun. It is fine to test your luck and never think of the winning in the gambling games because we don't have a big chance to be the winner.
I think it's different when you are playing online and playing traditionally. For online, less than half an hour of playing would be excellent, more than that; you might lose a lot of money there. If you play in a landbased casino, thirty minutes would not be enough; I just think if you drove all the way to the casino (assuming you live 15-minute drive or more), the time wouldn't be worth it. But the most important thing, in my opinion, is that you have bankroll management. I bet everyone would agree.
There is no special time to gamble, I personally am not a gambler and will not spend my time just for gambling. But regarding how long it will take to gamble, I think that will only make you lose more money if you target time every day to gamble. But with routine or habits, it is also likely to make a positive impact if you are able to do it well and vice versa.
I don't think you should target time on a daily basis. You might get addicted and wouldn't be able to cope up with other activities in your life. I think a healthier routine would serve you better in the long run, and gambling may take a lot of money from you.