Congratulations, 21 days is a good result. :) I think Los has a similar time. :)
I didn't even generate anything myself; I finished it in about 3-4 hours. I just ran around the map for almost two weeks, collecting chests for GM stealth. Although, the combination of Death Knight + Locusts + Phoenixes can be bypassed with Necropolis, but I don't remember about the Castle. If they can be bypassed too, then spending two weeks running around the map was pointless.
I also had to wait 3 days because the enemies scattered, but that depends on how quickly you eliminate them. If I had defeated him a couple of days earlier, I could have caught up. Clanmates, sorry, I don't always play well. :)