I cannot speak for Norway, but since my country, The Netherlands, is known for working even less hours, I seriously doubt the situation in Norway is very different.
Although those hours may be normal for the ordinary office and factory worker (and thank god for that), there is absolutely nothing abnormal about entrepreneurs, self-employed and people at start-ups working different and/or longer hours. (And even then most of them actually don't.)
We are neither lazy nor anti-entrepreneur. We just have decent labour laws to protect those for whom a job is just a job, which is 90% of the population.
But nothing is stopping the other 10%. Please note that this article suggestively heads a paragraph with 'Golden handcuffs' (including the quotation marks), but fails to reproduce any such quote, or any evidence of any kind of limitation.
It's just the typical desperate attempt to suggest that there must be something wrong that needs to change about prosperous countries where people work considerably less on average, and are happier and healthier.