I’m sorry, I can’t really help you with the labour quote. It is a bit of work to remove the Dualogic unit. 7 hrs sounds a bit excessive though… more importantly, what are they replacing? It does need recalibrated after installation. It’s just hooking up to the computer and run the process, takes like 15 minutes for all I know. But I don’t know what your shop charges, so again, it’s hard to say.