Typically when asked "How long?", I get a reasonably accurate estimate, but yesterday I was told 45 minutes. I thought that was a tad optimistic, but it was just an oil change and alignment check, and 45 minutes was not outside the realm of possibility. My car was already in one of the bays as I left for about a 40 minute walk. I returned from my walk, and saw my car being worked on; somewhat expected, so I started reading a book I brought. About 20 mintutes later (nearly an hour later after checking my vehicle in), I asked how much longer, and I'm told 45 minutes again... 2 hours after checking in my vehicle, I had to tell the desk guy, that my keys were behind him.
So, it take far longer than estimated. I was also not happy that I had to get the paper finished by breaking the desk guy away from his phone and telling him that I saw the mechanic bring my paper work and keys in.