I have tried to subscribe a magazine website using bitcoin payment and made a mistake by selecting low fee. There was 15 min threshold before activation of membership plan for the payment I made and that part didn't go well, due to unconfirmed transaction. I had to submit a ticket and still waiting a response from publisher.
So, I recommend anyone to check with other side, if fast confirmation is required. Otherwise it might be annoying to wait for a response.
The transaction is slow due to you chose low priority option, which offers a low fee, and miners are not ready to confirm it (which is one thing I hate.) The high priority option is made in within 10 minutes of the transaction. While the low fee option might take up to days without getting confirmed; I’ve seen someone say that his low fee transaction has taken up.to 17 days and still yet to be confirmed.