A visitor’s visa will let you stay on in Norway for up to a total of 90 days over a period of 180 days.
When you get a visitor visa for Norway, you can also visit any of the other Schengen countries as well.
You’ll need a reasonable cause if you want to extend your Schengen Area visa. Visa extensions are given for humanitarian purposes, such as staying to continue to obtain required medical care, essential personal reasons, such as a relative’s funeral, or force majeure, which may mean anything from the outbreak of war in your home country to severe weather conditions that make it difficult to fly back.
Reservation or itinerary for round trips. Dates and flight numbers indicating entry and departure from the Schengen area must be included.