Boburk,
I haul Overton's fish each year pushing between 6 and 6-1/2 hours before releasing the fish into the pond. I have no issues so 4-5 hours is easily doable. I have even successfully hauled and stocked Rainbow Trout from Overtons to my pond.....
I am about 45 minutes away from the fish truck route but elect to make the 11 hour round trip exactly because of George1 statements....
Just my .02 worth.....
Coupe