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Long sojourn or "national" Visas (NV), which are only valid for visits that are longer than 90 days (type D), with one or more entries, in the territory of the Schengen State whose diplomatic mission issued the visa. Holders of type D visas are permitted to circulate freely in Schengen countries other than the issuing one for a period of not more than 90 days per half-year and only if the visa is valid.