Let's see how long a vaccine usually takes from conception to reaching the market. In the best of cases, the discovery of the drug, its preclinical research, the development of its manufacturing system and the optimization of protocols take three to eight years. The three phases of clinical trials take between 10 and 12 more years, to which we must add another couple of years or a little less for the review of the regulatory agencies. That adds up to six years at best, 20 at worst. The first anticovid vaccine that has given promising results, developed by the American firm Moderna, it has taken six months from the origin of the pandemic to conclude phase 1.
