It depends on how much you bought and at what price, if you bought at all time high, any time is a good time to sell, because it will hardly reach those prices soon, maybe in December again and i'm being hopeful, it is always good to ask yourself why you are here? if it is purely for money then try to sell until you feel comfortable or have enough to cover your expenses, but remember that this is a long-term market and we are all here for the future.