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If you have your profile set to Public your hours have always been there.
Steam is part social network, so it’s expected. The play time is clearly counted, and you can choose to hide it. Steam does not count your offline hours.
From the 15 minutes I’ve played Switch, it did not obviously: record playtime, phone home, or give any option to be online/offline.
Click on your user icon in the top left of the home menu to find your profile. It’s pretty much the same as Steam in this regard.