Anyone who has ever deployed an app to the iOS App Store knows, very well, that Apple slows reviews during the US Holiday season. Additionally, anyone who has done this also knows that Apple review times are extremely variable from 1 day to 1 month.
I agree, the duration of the review is irrelevant to this complaint. I would suggest hiring SWEs/consultants who actually understand the iOS App Review process the next time you want to release an app, since Hey obviously does not understand it.