I've just about finished this thing (the first time) and it is about 90 days game time, and 30 days real time. Of course that's short compared to Might and Magic VI, VII, and VIII which took up to three game years to complete. The maps respawned after two years, so it was funny coming back to the lower level areas you had trouble with the first time around with high level chars and just pasting the hobgoblins and such. Mostly the MM game length was because it took weeks to train, every time you trained to gain levels, and in one of the games you might reach level 90 by the end.

I'm now in the middle of the game,I could've finished it,but I'm trying to do all the quests and I can,find and explore everything.So It'll take some time until I finish the game.