5 bucks. Use the promo code and they will match your deposit.
This is sort of misleading. It's not like you can deposit 10 bucks and 20 bucks will show up in your account ready to use. They essentially refund 4 cents of every dollar that you pay in entry fees.
Most people will probably never see their full bonus and the rest will have redeposited 4 or 5 times before they do.