Sanford Airport is one of the most expensive airports in Florida if not all of the nation for parking. Well they do have plenty of parking on site there are no competition parking sites off-site airport that's why their rates are so high. I read somewhere that they have a limit of 30 days though, but you might want to call them and ask. I'd suggest you check out having an Uber or a friend or a shuttle, even a taxi bring you since you've been gone, so long.
Yes, they have a couple of options for parking. The long term lot is about $14.00 per day.
Yes, pretty sure parking is sufficient but you might check with the lots themselves
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