We walked 700km through Norway in the summer, from Oslo to Trondheim (the South were most people live). The country was sunny and warm, it seldom rained, people were exceptionally friendly, and it had the best wild strawberries and raspberries I ever ate. The Dovrefjell was the only very cold place. We'll might move there in the future.
“in the summer” must have helped. In the depth of winter, there’s less than 6 hours between sunrise and sunset in Oslo (https://www.timeanddate.com/sun/norway/oslo?month=12), just over 4 1/2 in Trondheim (https://www.timeanddate.com/sun/norway/trondheim?month=12).
To make matters worse, the sun doesn’t get high in the sky.
Just because Norway is far north does not mean that it gets less sun all year round. It has more sun in summer, and less in winter.
You can be at the northern most point of mainland Norway now and wait for sunset. But you will have to wait until August. It's been up since May 11.