Wow, I didn't even see that was there! Okay so if I set it to say, the lowest fee on there, how long would that take about? An hour?
Paying the lowest fee won't guarantee you to have your transaction confirmed at the quickest that it can.
That's the purpose why wallets are giving recommended fees for you to have it the quickest that it can base on your adjustment. But if it's coming from a private wallet or closed source wallets, they have a commission for every transaction that their users make.
Paying the lowest would make your transaction go for more than an hour. I've even seen some TXs went even for days.