If you receive 8% income every 1 hour, you will double your cash in 9 hours, and add to your cash three new digits in 90 hours, as consequence. So, in 330 hours, you will have 1 trillion gold in bank, if you deposited 10 gold, without anything else. In 346 hours after depositing 10 gold, you will have 3t gold. By that time, you will have infinite gold, because you can't manually withdraw the income of 3t gold in a single hour...