Vaccines take years to come out
that is generally true, no disputing. I gather Mumps came out in 4 yrs & that was exceptionally fast (1960s?). Most of this time is spent convincing someone to give you money to spend on the project, and employing a small number of people to do a lot of work.
and years of testing
Ah, there, one can dispute. I suspect Jo Public thinks that the vaccine plan is announced & a zillion magic laboratory explorations & things happen...
COVID reality Scientists had the genome by early January 2020 so could formulate a vaccine that seemed to work within weeks after WHO recognised there was a crisis brewing.
followed by zillion cell tests are undertaken. That scientists then watch these cells for all the rest of the years for any problems.
Reality Standard procedure is to only watch cell reactions for a few weeks; the modern methods are facilitated by computer models.
Then (Jo Public reckons) a zillion tests on animals, and scientists monitor the animals for yrs afterwards.
Reality only need a few weeks of data on animals: this is standard not special covid procedure
Then a few human volunteers... and scientists monitor the humans for yrs.
Reality only need a few weeks of monitoring the initial volunteers: : this is standard not special covid procedure
Then finally lots of human volunteers & years of monitoring afterwards.
Reality: only expect to monitor for about 6 months -- this is standard not special covid procedure
Some monitoring may continue, but fundamentally, if the jab looks good after 6 months & the jab is badly needed, it will accelerate into being given to people immediately. Look at how fast the Ebola vaccine got into real people. Anyway, no amount of years of monitoring in clinical trials can catch raised risk for the extremely rare side effects (like 1/250,000 blood clots).
The covid jabs on offer are as safety tested as any vaccine can be. They each had their ~6 months like the others.