I think this is directionally useful, but the work time involved for the things you actually need isn't 4-5 hours, so a shop that charges you for the time they put in, not some package price for things that don't need to be done, or some flat rate pricing, is going to save you a lot on labor as well.
In my opinion, dealer service is good for a few things: warranty/recall work; if the work requires proprietary special or hard to get tools (KDSS pressurizing rig, for example); if you want to have a pristine service history (perhaps for maximizing reasale value); you can't find a good independent shop; and things of that sort. Otherwise, they will always be the most expensive way to go for retail factory parts and labor costs. In my opinion.