Forgetting gambling is not an easy thing because when you enter the casino website or a casino website you will remember your losses. Though the gambler would forget it but it will take some time likes years.
But everyone has their own ways of forgetting things some are easy while some are not.
It's not really about completely forgetting that you lost a certain amount the previous day, because definitely if you lost $100 today while gambling and you log back into the casino the next day, you will remember the loss you had the previous day, but in this topic, I believe that what OP is insinuating is how quickly do you let go of the pain or heartbreak of facing losses while gambling. If you had lose today, when you start to gamble the next day, will you still have that heartbreaking feeling of the past losses? If no, that means you quickly let go of the pain, to embrace new chance.