How quickly do you forget a loss?
Well, that depends on the situation and the amount lost. Let's say I got a good amount of wins and decided to get more greedy and then lost everything eventually, including the capital. That could be hell for me, and that'll take at least a couple of days, if not a week.
With regular losses, which I have anticipated before I go gambling for the day, I can say, I can forget it just a few hours after leaving the casino. I think most gamblers do. The only time you will have a hard time forgetting a loss is when you decided to become greedy and lost it.
You are right, it all depends on the amount of money lost, I don't think any gambler is too mature to let of huge amounts of money they lost easily...This is the reason why it's important to gamble with what you can afford to lose..like you said, it's easier to to forget about losses that are regular, but remember that even regular losses can accumulate into an amount of money thats really signficant