Actually I built the first dungeon myself and then I filled it with enslaved Cartography Gnomes who now do all the work for me. Delegation of responsibilities is an important skill for all evil overlords to learn.
Mundane Explanation: I did the maze last week but didn't get around to posting it until a few days ago. Stockpiling work and posting them in succession gives a great illusion of speed. I did the last map during a night when I couldn't sleep. I have a ongoing insomnia problem due to the pain in my feet (from my neuropathy). Those times I can't sleep, I usually spend fooling around with Photoshop. It distracts my mind and helps me forget about the discomfort. That and I don't watch much TV. It is amazing what you can get done when you're not watching TV.*
* Unless there is new Doctor Who on. I'll gladly give up time to watch that. Can't wait for the next Special!