I played with the reveal; using Taz I built up the fort in the lower village and studied the development tree, so I took archery and broke through the griffins in the Dragon Utopia losing 20 gnolls, which established a great tempo from this flank, but the other flank was too dull; there isn't enough time to finish it, and the fact that an exit is possible has been proven)

Though it feels like an exit might be possible even earlier if you don't chase cons, around 123. The hydra external dwelling is taken by Valeska, who on my second day took Pandora for the ghosts; hydras in the Castle are built up without cows, and the secondary is up to 1-3 in the citadel.