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It depends on your skin color [0]. For people with light skin, 13 minutes of direct midday sunlight three times a week may be enough. But for people with dark skin, you may need 30 minutes to 3 hours of direct sunlight (the article doesn't make it clear whether that is three times a week or once a day) to get enough vitamin D.

[0] https://www.healthline.com/nutrition/vitamin-d-from-sun#skin...

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> 13 minutes of direct midday sunlight three times a week may be enough.

There's a metric left out of this equation.

How much of the body must be exposed?

That little? So my four hours of tennis a week in the hot Greek sun is much more than enough, even with sunscreen on.

Playing four hours of tennis under the hot Greek sun may lead to other health issues though.

Such as?

Tennis elbow, I'm guessing.

That's one (or two, for each elbow).

Maybe increase your chance of melanoma.

Four hours a week? Non-consecutive?

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