A developer training firm named Shiny Development has been tracking waiting times for the App Store review process as closely as it can, and it has bad news for would-be app developers: The waiting times for the Mac App Store are growing longer. In the last six months or so, the waiting time for getting a Mac App published has gone from under seven days to almost as high as a month, according to Shiny's data. Apple's process is largely closed off -- there is a little bit of information for developers on the main dev website, but otherwise Shiny has mostly gathered this information from the various developers it tracks and corresponds with online. If indeed the times for the Mac App Store have gotten this bad, it could mean that big apps are getting delayed longer and longer, and that could be trouble for the platform in general.
The good news is that the iOS App Stores' waiting times appear to be going down over nearly the same time period, from 10 days a few months ago, down to right around a week now. Apple has hired lots of app reviewers in the past year or so, and that's likely the reason for dropping times: As it has more people to check incoming apps, it can get approvals through the system quicker. Hopefully there's a bigger horde of Mac App reviewers on the way, so these apps can get out to the public in a relatively timely fashion.