'How Does This Help Working People?' Fury Over Trump Mass Firing of Health Workforce.

For the federal government it is 1 or 2 years depending on your job type.

For federal career civil servant jobs, yes. It's because those jobs have (until now/soon of course) protections so they can't (until now/soon) be easily fired for political reasons every time the party in power changes. That's why the probation period (when they don't have those protections yet) exists so that there's time to evaluate if someone turns out not to be fit for the job, before civil service protection kicks in.

Of course the first thing trump did was decree the "Schedule F" tactic (see Project 2025), which will remove those protections from all federal jobs so anyone can be easily fired, but until that is fully in effect, they're going ahead with the low-hanging fruit and firing all the people who don't have the protections--those still on probation, which firings can't really be legally challenged like "Schedule F".