How much time is reasonable for work to be done

The warranty servicing dealer has to investigate, document and apply for warranty coverage. Before starting repair. Parts are ordered at that time if not available.

If one item is say Dometic, they reach out to Dometic. If the Atwood heater doesn’t work, they reach out to Atwood.

Now they’re waiting on parts.

Wrong parts come in; start over.

Sure dealers drop the ball but it’s not like a car dealership that’s dealing with the factory for everything.