VISIT or WORK in POLAND
A D-type national visa permits to enter the territory of the Republic of Poland and to stay continuously or for several successive times in this territory for a total duration of more than 90 days during the period of validity of the visa, but not longer than one year. A D-type national visa also permits to travel in the territory of other Schengen Area Member States for up to 90 days during a 180-day period, during the validity period of the visa.