How many days does a mild cold and a severe cold last?

Slight cold and severe cold add up to about 30 days. Slight cold and severe cold are two adjacent solar terms. The light cold time is between June 5438+1October 5-7, and the heavy cold time is June 5438+1October 20 or 2 1. Slight cold is the 23rd solar term in the 24 solar terms, while severe cold is the last solar term in the 24 solar terms. After the great cold, there are twenty-four solar terms.