ze_ApertureScience_final is the only other map I can think of that this problem arises where time runs out before humans reach the safe spot and zombies are nuked. Although a 10min map time may fix this problem and not hinder other maps. Ones like ze_trainescape_b3 where the map "nuke" doesn't always kill the zombies (ex: For trainescape, you can hold out in the tree-house or shoot zombies off the train until the time runs out if nuke doesn't kill them). Perhaps just extending the map duration for Jurassic Park Escape and Aperture Science would be a possibility?
-Chef