To be fair to CA 20 min may be a bit short in some cases, but in real war, (and I speak from experience) Time limits are very real. Fatigue, rations, water, weather, health, all play a part. To say nothing about how truly freaked out you get just knowing that there is someone out there in the bush with an AK with a round with your name on it. Also there is the bigger picture to think about. If my troopers don't take objective X by time T then unit Z gets the s**t blown out of it because I screwed up by lolly gagging around having a short arm drill with the guys.