The number of postdoctoral positions required before obtaining a permanent position can vary significantly depending on several factors, including the field of study, the individual's research productivity and achievements, the competitiveness of the job market, and the specific requirements of the desired permanent position.
In some fields, such as academia, it has become increasingly common for aspiring professors to complete multiple postdoctoral positions before securing a tenure-track or permanent faculty position. This can be influenced by factors such as the availability of academic positions, funding constraints, and the level of competition for faculty positions.
While there is no fixed rule or predetermined number of postdocs required, many researchers aim to gain multiple postdoctoral experiences to enhance their research profile, expand their network, and build a stronger publication record. By doing so, they increase their chances of securing a desirable permanent position, whether it be in academia, industry, government, or other research-related sectors.
It's worth noting that the landscape of academic careers is evolving, and alternative career paths beyond traditional academia are becoming more prevalent. Some researchers may choose to pursue non-tenure track positions, industry research positions, or other roles that do not necessarily follow a strict postdoc-to-permanent position trajectory.
Ultimately, the number of postdoctoral positions an individual may need before obtaining a permanent position is highly variable and dependent on numerous factors. It is advisable to seek guidance from mentors, advisors, and professionals in your specific field who can provide more tailored advice based on your goals and circumstances.