You are saying this as an automated script which pay from new investor money to old one. But you have fixed 100 hours to get 200% back. How it is sure that site get enough money from new investor to double the initial investment within 100 hour. So it sounds this will not sustain for more days. I will stay away.
If the wallet is empty, it's croned (cron job) every hour till there are.
As you can see the hot wallet was used only once - to be paid to yesterday giveaway winner.
https://blockchain.info/address/1HuWwnEnTZqEjxb9MepSTTw7MG4j7DCqtw