I’ve completed my first map but I’ve same question:
1- I use to do the final compile the option Q3MAP2: meta vis light filter bounce etc etc but I’ve start to compile at 22.00 and isn’t finished and it take long time when appear the dos window of portal:

is normal that it take very long time or not?
However I’ve stopped to compile… 
2-Where I can find a simple and good tutorial for do arch?
3-How I can add a fog to the world (all my map)
4-I can’t load the prefab…whenm I go to Edit anmd load prefab I can only select the file with .map extension…