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[–] MrPim 1 point 10 points (+11|-1) ago 

They usually don't wear them all day you tard

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[–] 24536969? 0 points 2 points (+2|-0) ago 

And the stress of breathing through a mask lowers their sp02 enough to measure even in a single hour.

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[–] xpat 6 points -4 points (+2|-6) ago 

Oh yes, they do. And often "the day" has 12, 16, 24 hours or more.