R_J_K75
Legend
Become a speed-reader... Prepping any size module is the same basic process. It just becomes much harder when you have to remember 2-3x as much information because the module is larger.
Generally Ive written my own adventures because I retain it better. Even then I only create an outline with a few NPCs, monsters, maps, and a general plot. Ive found less prep makes me react to players and makes for a more organic game.
When I run modules I keep it to ones 10 pages or so. Short enough to get through in about 4 hours. This way before game day I can read through it once without taking notes, then a second time to take notes and highlight important parts. Come game day I'll refresh my memory one last time. This way Ive familiarized myself with the material enough improvise if the players do something unexpected as they always do.