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near Holmenkollen, Oslo Fylke (Norge)
It's half and half on easy off-road paths and a few more mountain-like paths. Remember there's almost always an easy alternative to the mountains path I choose, they're clearly visible on a app like Kmoot. It isn't particulary difficult but since it's quite long, it's not for everyone.
I've done it in late June.
Let me know what you tink about it in the comments if you decide to do it.