alextet
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I completed the brown difficulty in 7 months and 2 weeks. Two treasure vaults were enough to buy all the birds, archangels, titans, and golden dragons, plus upgrade all the archers to snipers. I got the Air book at the end, 2 weeks before the game ended. Luckily, the Portal was in the Tower, which made it easier to gather an army. My main hero is Mephala (level 40), and Jelu is my secondary hero (level 34). In the final battle, I only lost 2000 snipers; the enemy was too scared to attack the rest.
PS: The computer surprised me. While playing in the Tower with a Wizard as the main hero, I didn't create a single Wizard.