According to this calculator https://ethgasstation.info/calculatorTxV.php your transaction will take on average 4 hours because of the low gas price you used. If you had payed 40 Gwei, it would have taken a bit more than 10 minutes.
I would recommend using that calculator to decide what gas price to use in the future.
But i sent it 6h ago so it should be done already, right?