40 days. "Sanfu" is the collective name for the first, middle and last days, and is the hottest time of the year. It occurs every year from mid-July to mid-August in the Gregorian calendar.

The period from the third Geng Day after the summer solstice to the day before the fourth Geng Day. The third Geng day is the first day of Fu, which is the first day of Fu. Zhongfu, Erfu, the period from the fourth Geng day after the summer solstice to the first Geng day after the Beginning of Autumn.

The fourth Geng Day is designated as the first day of the Zhongfu. If autumn begins before the seventh month of the lunar calendar, the Zhongfu lasts for 10 days. If autumn begins after the seventh month of the lunar calendar, the period will last for 20 days.

The period from the first Geng Day after the end of the month, the end of the month, and the Beginning of Autumn to the day before the second Geng Day. The second Geng day is designated as Chufu, which means the end of Futian.

In summer, people are active for a long time, sweat a lot, and consume a lot of energy. They should eat more nutritious foods such as chicken, duck, lean meat, fish, and eggs to meet the metabolic needs of the human body.

Summer seasonal vegetables, such as lettuce, cucumbers, tomatoes, etc., have higher water content. Fresh fruits, such as peaches, apricots, watermelons, melons, etc., with a water content of 80 to 90%, can be used to replenish water.

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