Two of my Android apps went through in 3 hours last night (not to rub salt in the wound!).
They're a lot less complex than MRA, but I suspect it's to do with permissions requested (such as location, storage, access to device sensors, etc) which are a higher risk to users from Google's point of view, and need to be thoroughly tested. Maybe there's a location-specific test team and they're overwhelmed?
Just politely let Google know they're falling behind the competition, and it's reputationally embarassing.