Thanks for the info, all. I got an email that said "It is possible that the shop dates you have been assigned have been altered slightly, due to being too close to other shops assigned/performed. If these dates work for you, great! If they don’t, please respond to this email suggesting an alternative date range (Monday through Friday)."
I can do those dates, so I didn't respond. But I was still surprised at the big difference in dates (not "altered slightly" as claimed). Every shop has it's quirks and it's good know know about this one. Thanks again.