Quote from icsIf your map compiles very long, there's propably something wrong in the map itself that makes it take long time. Something that needs to be func_detail or very open areas that have multiple height differences and such. Especially if vvis part (the first one) takes long, it could be a sign from it.
Didn't properly know about func_detail until 5 hours into compile. Just done it in 45 mins! XD