I would slightly disagree. You would need to define: what do you mean by a short period of time? Do you mean six months, one year, or five years, etc.?
Slightly? Sounds more like completely?

As I said in my other post, how long after the Covid vaccine was given did all the side effects become apparent? Two years is ample.
Everybody's body and immune systems are different due to various influences, and these side effects can appear at any given time over a certain period of time.
Yes individual immune systems can show variances, which is why some get side effects to vaccines and others don't. However the side effects will initially show within a very short period of time,normally the first days or week after inoculation and not years after.
That does not mean to say that the symptoms of that side effect are also always short lived. They usually are, but for some they can persist and may even be lifelong.
However you will not suddenly develop a new side effect of a vaccine months or years after you have received it.
With regard to how effective a vaccine is under 'real life'conditions (as distinct from laboratory/trials) then that may take some years and is always part of an ongoing process.
In the case of MenB vaccine it is looking likely that is not effective being used 'off label' for Gonorrhoea, but is both safe an effective for its original purpose
