Some limits are: If you have less than $25000, then you are only allowed to do 3 daytrade in every 5 business days. (Day-trade means to buy it and sell it on the same day). But if you have more than $25000, they will remove those limits for you, i.e, you are allowed to do as many as daytrades as you like.
Call them or see them and make the policy clear.