How long does the sun shine a day?

Sun for about 20 minutes when the weather is not hot and 5~ 10 minutes when the weather is hot. The best time is 6 am to 10 and 4 pm to 5 pm. However, the time for sunbathing in the summer afternoon can be slightly delayed.

Generally speaking, people with fair skin can meet the demand of vitamin D production by sunbathing 3-4 times a week for10-20 minutes each time. If you want to synthesize vitamin D artificially, you'd better choose to bask in the sun from 10 to 2 pm. When the weather is very hot, sunbathing for 5~ 10 minutes at a time is enough.

Special population

Pregnant women: need to bear the calcium needs of two people. It is enough to bask in the sun for half an hour every day in summer, and not less than 1 hour every day in winter. You can't stay indoors all day, because your body is inconvenient.

Children: The need of development makes them need a lot of calcium, and they are the most vulnerable to calcium deficiency. So starting from two months, you should go outdoors to bask in the sun every day. 9 ~ 10 in the morning and 4 ~ 5 in the afternoon are suitable time to go out. The time to receive sunlight can be gradually extended from the first ten minutes to one hour. When the weather is not too hot, you can bask in the sun and stay in the shade for a while. Don't be in the sun directly in summer, because scattered ultraviolet rays can also be received in the shade.