I myself defeated the beaver on the second day, and then spent five days collecting everything and waiting for my army to grow. I was afraid that I wouldn't be able to fight dragons with a small army. Well, on the 8th day, I went to the Necropolis with 8 trolls and 10 Ogres...
It took a very long time after that, and it took about 22-24 days.
Maybe I'll gather my strength and try to replay it sometime. Every turn felt like dragging a piano up to the 9th floor.