I do that in an hour easily.
You are an expert gambler, and you've got a big winning history. Not everyone has got the patience to gamble as you do. I've done it in the past through Dice, and the same got ruined on the same day. It's not about the greed, but the lack of self-control. I started to gamble at midnight and reached $10k+ in the early morning. While having breakfast, my wallet is empty. This is a possible thing, because there is one year, and all we need is the perfect plan and patience to handle the bets.
I don't believe there's such a thing. Expert gambler? Nah. I think he said that because he is betting with high amounts and $10k will definitely be easy for him if he will bet $1k for each round and win it with x1.5 or maybe more. Also, I believe he is just being arrogant about what he said and he may win that amount fast but he can also lose it way faster than an hour.
Gambling is a win or loss in any game or sport. Even the most favorite team can lose at x1.05 odds. But those who will gamble the $1k slowly and wait for a high multiplier could also take a long time before it happens. It's better to just keep it or save it.