If you sell your free stock, you have to keep the cash value of the stock in your account for at least 30 days before withdrawing it. After the thirty-day window, there are no restrictions on the proceeds. For example, if you win one share worth $10 to your account, you can’t withdraw the $10 you receive by selling the stock until thirty days have passed.
The cash value of the stock is determined by the price of the stock at the time you received it. You can check out your History tab for the stock’s value.