In order to get and approved or emergency use booster in people's arms, what is the latest timeframe they need to get the trials for phases 1,2 and 3 up and running? I wonder if they already have people signed up. If not, how long do you suppose it would take to gather up volunteers?

Some of the earlier vaccinated folks would most likely need the booster by Jan/Feb 2022 if it’s needed at a year, and even sooner for people who were in the initial vaccine trials.