I am not the OP, but I recently posted a hobby project of mine to the Mac App Store and went through a similar experience. The app was waiting for review for about 9 days (7 business days) then got rejected because the reviewer found a small (but legitimate) issue with some menuitem text. I fixed it and then it sat in the queue for another 8 days or so.

I can't imagine being commercially dependent on that kind of process.

It was the hidden one for IAP's. Oops!