Just dropping a map from PDF into UDK is easyish and doesn't take more than 10 mins (after some practice) but before you can do that you need to have a working 'game' (that handles the top-down camera, etc.) and some pre-made game assets (in-game torch for fog-of-war,etc). I'm considering releasing my game and assets but there are some hurdles to overcome first.
Usually I also want to make masks for only the insides of levels, add all levels of the same building on the same map (toggle visibility with a trigger),etc. and that all takes time.
If I want dynamic lighting inside a square buildings I've added invisible walls that block light on top of .pdf map.
I've been tinkering with the idea of a more packaged approach (as our GM is changing). I'm thinking about a ready-made UDK game that load up a .png map of your choise (or you can paste it from clipboard) and it handles all the rest (just loading the map and adding fog-of-war)...work in progress.
[Edit:] UDK has a steep learning curve. I had a solid background in programming, some in 3D graphics programming and nothing in 3D graphics design. It took me a few weeks to get the first version of the game up and running the way I wanted. I used UDK from the day one of our Council of Thieves campaign - every encounter, every map. And I've learned new stuff all the time. I used UDK because I wanted to challenge myself and learn something new - in that I succeeded.
