I have a Coinbase account.
I Buy Bitcoin hoping that it will go up.
It goes up and I would like to close the trade.
I open the order and the only option I have is to "Cancel Order."
I'm assuming it's because the order has not yet been filled.
Once the order is filled I will be able to close the trade.

It's been 30 minutes and the order has not yet been filled. So I canceled the order.
How long does it take for an order to be filled?