I don't set a specific time for gambling, I gamble whenever I have free time. I never gamble by spending important time, it is not wise to gamble outside of prudent money and prudent time. It is also important to know when to quit. Especially when we keep losing and plan to chase after defeat, it is better to quit. Because, chasing defeat can never lead to success.
Gambling is supposed not to have a timing if at all we want to be a responsible gambler that would not gamble everytime they need money. The idea of gambling is to make some profits and go away and not to continue gambling after making profit that should have made us to rest and leave gambling alone. Those gambling everytime will have themselves to be blamed when things goes wrong.