With a Norway Tourist Visa, you can stay for up to 90 days within a 180-day period. This means you can spend a maximum of 90 days in Norway and other Schengen countries combined within six months. The 180-day period is counted from the date of your first entry. If you leave and re-enter, the total number of days must still not exceed 90 days. It is important to carefully track your stay to avoid overstaying, as this may affect future visa applications.