The amount of sun exposure needed to produce enough vitamin D also varies by skin type. For people with fair skin, about 15 minutes of exposure may be enough. However, if you have darker skin, you may need to tan for 30 minutes to an hour to get the same benefits, as darker skin produces vitamin D less efficiently.

Additional Considerations for Improving Vitamin D Absorption
If you can’t get sun exposure during the recommended hours, it’s still possible to produce vitamin D before 10 a.m. and after 4 p.m., although UVB levels are lower during these times. But it’s important to be vigilant about prolonged exposure to UVA rays, which are constant throughout the day and can be harmful to your health.