London to Manchester is about 4 hours of route time on the M1 and M6. Edinburgh to London is closer to 7 or 8 hours on the A1. Add loading and unloading at each end and you have the full job time.
Getting the van size right matters more than most people realise. Two trips in a medium van usually costs more than one trip in a Luton, because the round-trip route doubles both times. The booking system shows all three sizes side by side so you can compare before confirming. The driver loads at your address, drives the route, and unloads at the destination with no handoff to a regional partner along the way.