Before the permit expires, within the application window set by the legislation. If family members’ permit periods have diverged, aligning them on a single calendar means one extension round per year.
There is a concrete window: extension applications can be filed up to sixty days before the permit expires, but must be made before it lapses. Where the application is filed in time, your stay remains lawful until the new card is issued; miss the deadline and it becomes a fresh application on a slower track. Aligning the whole family onto one renewal calendar keeps it to a single, well-timed round each year.
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