If someone is like that, that's a normal thing for a gambler to experience. Regrets are always at the end of the action that we do and if it's with gambling, whenever we lose a little or a lot of money, we're there to just admit the mistake and then will call it a regret and will think of something better. It doesn't matter how long has been one able to regret his actions, be it one or two days after he has gambled as long as it's the end of his gambling activity then that should be still enough to say as a regret because it's at the end of it.