IMO, if the dealer schedules an appointment for work to be done, regardless whether it is warranty or not, they should begin working on it before the end of business of THAT DAY! I might be generous and give them until the next day to begin, but after that I would have words with the service manager.
By the third day, if it was a warranty issue, I would be calling the manufacturer's area manager asking for an intervention. If it was not a warranty issue, I would be considering picking my unit up and finding someone else to fix it. On the fourth day, I would be out of there, never to return.
