Walkthroughs of standard maps, focusing on SPEED.

I checked it out just for fun. It took 4 days.

Yes, the "Key to Victory" map can be completed in 4 days, and it's not particularly difficult. But it's impossible to do it in 3 days. At best, I'm short by just 1 square before reaching Moneru's tent, and he's the fastest. This is assuming that in the first turn, he spends the night with the enchanted fairy, and in the second turn, he spends the night with the angel. The only chance to reach him is by exploiting a bug where you can have a hero spend the night without an army.
Behind the castle, the art resets, and gloves might drop, but you can't buy enough heroes to pass them on to Moneru. Without bugs, the only way to complete it in 3 days is to play like a chess master, moving diagonally. :(