Currently doors spawn for about 30s after they have been opened and then depop – this is rediculous since I have found myself running to doors only to have them disappear by the time I get there.
The doors are a nice idea but the mechanic needs some tweaking – perhaps make them spawn for 5-10 minutes and keep spitting out mobs like they did this morning before despawning so that people can gather around them and create mini-events? Its actually fun have 20-30 people gathered killing mobs