A few days
In Fotune's Pier, Warehouse no.10 I think, if you go downstairs you can play big or small. Save the game and play. Bet ALWAYS in Chow and if you win, you'll get 4000HK$ (betting 500). Enjoy capsule hunting.
But there's more in Kowloon. This one is extremely hard to do. Go at Old Governement office site and play big or small with the guy with little moustache and yellow shirt. Every bet cost 300HK$ but if you bet in one of the six "Yidian Wai Sik" (3 same numbers that you have picked appearing in the result) , the payout is x200. That means you win 60.000HK$. I won 120.000HK$ in 30min in the game. In real life it took me almost 7 hours reseting and betting. I'll do it 2 more times.
Of course, if you win, quit, save and play again.
EDITED: Almost forgot to tell you. Most of dice numbers I got in Yidian Wai Sik are:
- 1-1-1
- 2-2-2
- 6-6-6
Start betting with these numbers (in Kowloon). I supose you'll have more probabilities to win because the problem is not having the 3 same number. The true problem is hitting the result.