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If audited you'll likely be disallowed those. I'm not sure what the mileage requirement is, but I believe a part of it is that you stayed the night in a hotel at least 100 miles away? Something of that nature. It's probably a good idea to talk to your tax person about it. If you don't have one, you should get one, they basically pay for themselves.
You do not have to stay in a hotel to deduct mileage. I have been told, not sure if its true, that you cannot count the mileage to your office or on the way to your first appt.