According to http://appreviewtimes.com, the average wait time for approval in the Mac App Store is 1 day
The site you linked uses tweets with certain hashtags related to publishing in the app store as "data". This is highly inaccurate, not statistically profound, biased, easily manipulated and not conformable.
(That's why you're downvoted, probably)
True, but it's also "all we've got" and from my experience, the review times reported are accurate to within a day