I'd say the general format is like standard Letter size, but honestly so long as it isn't absurd, I'm fine with other formatting - booklet, trifold, etc. and the 12 pages is a max, not a required number. You could even do a one-page dungeon if you want!
Ahh full letter! Alright thank you, 12 full letter pages should be enough, I want to do a small point crawl with 3 dungeons in it and that should be plenty of room for it!
