A couple of days ago, I had a transaction take 1 hour to confirm! Never had that before, and have since increased the fee I pay in the hope of avoiding that in the future. I wonder if the network is becoming overloaded.
I ever had a transaction it took 9 hours to confirm, it must be the fee, it's lower than recommended fee, or maybe it's too small as we know that the highest fee you provide of course fastest confirmation you get.