Average App Store Review Times Shutdown
From March 2011 until March 2019 this site aggregated and averaged crowdsourced data on the length of time that app review for the iOS and Mac App Store took. From the very start of the App Store, until May 2016 the length of an app review was often very lengthy, causing problems for developers trying to schedule releases or set the expectations of their clients. This site was set up to track average review times so that developers could plan their releases with a little more confidence.
Source: appreviewtimes.com