We have the chance to go to Myrtle Beach on our way to WDW. Online mapping shows the path driving on 17. It looks like a beach road. Is it slow? Is the estimated 9 hours accurate?

Also - how bad is the traffic in the Myrtle Beach area? How long does the drive really take from the beach to the dinner shows? Is it the stop and go we have seen on all the other beach paths? (So triple or more of the online estimates?)

Thanks