as long as the other side of the pin is not taken out it remains valid.
It can stay this way for many days. The pin is a reversal candle and it can take a while for price to build the orders for the market to reverse. This is also why quite often you will see a pin bat and then an inside bar straight after. This is the market shifting orders and getting ready for the market to reverse.
So there is no rush and contrary to popular belief this waiting can actually be a good thing and a building of orders for the reversal of the market.
Thanks Johnathan, as far as i can remember, this hasn't come up here before?