Had no answer, so reposting my question:
Would anyone know for sure: with a 1 year renewable residence permit in Belgium, what is the residency requirement? Ie, what is the maximum time in a year that one can be outside Belgium, travelling, for work, whatever?
Are the rules different if the permit is issued to a pensioner who effectively comes to Belgium to retire - what are the residency requirements then?
Thank you very much for any concrete information.