Originally Posted by dwayne_hicks
Doom 3 itself has 27 levels, but I've seen the "speedrun" of 10 hours isn't all that hard to accomplish.
I read somewhere that "The Lost Mission" is only seven levels long, shouldn't take more than 2 hours I imagine.
Resurrection of Evil is 12 missions long, so I'd say maybe 4 hours.
Yeah, a friend of mine finished the Lost Mission on Nightmare in about an hour and 45 minutes. Doesn't seem long at all.