Well being able to savor the feeling of winning gives you a belief that you're invincible so probably he's not going to stop since its a pretty big amount that he got. Best advise would be just to practice caution since we can't really tell him to stop
If someone keeps on rolling for a longer period of time ,the era of invisibility will vanish without a doubt,people who win big must get out and withdraw their profits rather than rolling for a longer period of time,i have won and lost but over all i am in profits with all of my gambling history because one day i was having a good day in dice and that settled all of my losses.