I'm assuming Grezzo is making this remake, like they did with OoT3D. But after OoT3D they helped out on some other games and made the Flower Town StreetPass game for 3DS I believe. Also, Grezzo is probably a fairly small operation, and Majora's Mask is a weird game, so it's impossible to estimate how long it would actually take them. But you certainly can't compare them to the original main Zelda team's timeframe of making Majora's Mask back in the day.
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