This article explains the residency requirement under Slovak citizenship by descent.
Despite the political signals that this might change, the law still requires residency during the application process for citizenship by descent (but exceptions might apply). However, residency does not mean a long-term stay. For instance, if the application process takes a year, a stay of approximately six months would be sufficient. During this time, you can stay in Slovakia for various reasons, ranging from studying, working, conducting business, or engaging in research during a sabbatical. SLAC holders do not have to state a purpose for their stay or residence. Once the citizenship application is successfully processed, you can de-register and leave.
We can assist you with finding local partners who could offer you a research stay, temporary employment or suggest places to study.