Barsel your question has no logic....yes there have been vaccines with shorter testing times (thinking vaccinating people against smallpox with cowpox) but length of time has limited relevance. Think of painting a house. If one person does it and works 8 hour days lets say it takes 8 days....put two people on the job and it takes 4 days...same job....have 4 people and it takes 2 days...same job. So if you put the vaccine production people on 24/7 working and buy in extra equipment, a job that might take years can be reduced to months. we also know much more about what to look out for in the early stages of testing and as someone, sorry can't remember who, said on TV last night, there has been quite a lot of "background" research going on for many years about delaying with similar organisms.