I actually prefer this website more for checking the schedule:
http://splatooniverse.com/
I don't think you need to log in to MiiVerse to make the schedule show up and it's right at the front page so you don't have to click the Stages schedule. It seems to break on new levels though
I'm fine with how Splatoon does rotations currently, but I would not mind having 3 hour rotations.
My only concern with 3 map rotations would be the fact that certain weapons that are more niche would get indirectly nerfed as a result, because they may have 1 or 2 good maps in a rotation with the rest being bad maps, and become used less often as a result. For example, IMO, Splash-o-Matic would probably become an inconsistently useful loadout on a rotation with Walleye Warehouse (good), Blackbelly Skatepark (good) and Moray Towers (BAD).