A minimum of three days is necessary to see a good portion of the island; a week allows a visitor to do it justice and take the time to enjoy its scenic outdoors at a relaxed pace.
In order to see quite a bit of the island, you'll need at least 3 days.
A weakened and suddenly unstable Communist Party installed former First Secretary Gomulka as leader without consulting Moscow, an event that prompted Soviet, East German, and Czech troops to amass on the Polish borders.