- A maximum of 5 years after obtaining the Ph.D.
- Incoming holders of a doctoral degree obtained abroad who do not have Czech citizenship, who are not residents of the Czech Republic or who have not spent more than 12 months in the Czech Republic in the last 36 months.
- Holders of a Ph.D. (or equivalent degree), Czech citizens with long-term experience abroad. Long-term experience abroad can be defined as at least 12 continuous months out of the last 36 months in the form of doctoral studies abroad or in the form of employment at a foreign scientific institution, or a combination of both.