It takes 6-10 years to develop a new vaccine from scratch.
Ebola broke out in 2014. Vaccine development commenced. The vaccine was approved in December 2019.
Comes now Operation Warp Speed in which the Trump admin is trying to use advanced management techniques (and some risk tolerance) to urge the private sector to develop a vaccine for COVID19.
The usual cast of characters came out of the woodwork and said, “Can’t be done. Will take at least five years.”