How long can they stay, can they change host/activity, can family accompany, and can the status be extended?
The checked official sources did not provide enough route-specific evidence to confirm the length of stay, change of host, family accompaniment and extension rules.
See recorded sources
Limits of the record- Not established: the correction failed a second independent check (NAO_SUSTENTA: The grace sentence is now cited (the old defect is gone), but 'USD' is in no citation (the header excerpt omits the 'USD' line). The Film-maker (non-commercial) 40/75/380 row, the extension rules and the dependant rule are cited.)