Just to add this to some sort of hall of fame and so I remember, before this gets knocked off the leaderboard, this is the fastest someone has beaten ZDM so far that I am aware of.
I currently have got the longest survived so far that I'm aware of, but I didn't win so I'm not sure it counts.
And here's the most zombies killed in a game so far.
If anyone gets a really fast or slow time or kills a lot of zombies, please share!