no it is not like that, once you get it is valid for 5 years, and you do not have to prove anything, only the first time on the application you have to justify it with a course or medical treatment or that you are working remotely, after that you are free to come and go as much as you like, there is a maximum stay of 180 days that can be in any case extended to other 180 days, there is a speculation on the fact you can extended it every year or not, it is not specified, some says you can extend it the first year only, others says you can extend it every year, but there is not a minimum stay….