Hi! It is 26 pages. The whole dungeon is visible in the screenshots, and the village has 7 briefly detailed locations. The book has tools for generating the town and townsfolk as you go.
It probably takes 1-2 sessions to "finish" it.
The dungeon is set up like a real space with a single enemy faction inhabiting it. It has a couple of environmental hazards and some mysterious lore baked into the environment, and a few friendly/neutral NPC interactions.