Advanced postdoc years
One to two years after your doctorate, sometimes three or four years, you move into the advanced postdoc phase.
You have made a conscious decision to pursue an academic career and would like to qualify for a professorship. In this advanced postdoc phase, you are therefore working on a habilitation or equivalent achievements.
Most postdocs in the advanced phase are employed as a postdoctoral researcher at a professorship or in a third-party funded project. Ideally, they have been able to acquire their own externally funded project or even have their own junior research group or a W1 junior professorship.
In all cases, you will prove yourself in research and teaching so that you can later move on to a permanent professorship.
Finally, the most important thing: in the advanced postdoc phase, you develop and sharpen your own research profile. The longer the phase, the more research you do for yourself and not for your supervisor.