FullWings, you beat me to it - I was thinking of the exact same '9 women can make a baby in one month' as I read AfricanSkies post.
As I previously noted, there are already vaccines undergoing human testing - creating the vaccine is not the time consuming part. It's the testing to make sure it works and isn't worse than the disease that takes time. That testing normally takes ~18 months. Skipping most of red tape and throwing unlimited resources can shorten that, but you're not going to turn months into weeks. Doing the job right takes time, and when you're talking millions of lives, you damn better make sure you get it right.