How many days to recover from a cold with no strength and weak legs need to be judged according to the condition of the disease, usually about 5~7 days to recover. Colds are mainly caused by viral infections such as rhinovirus, parainfluenza virus, respiratory syncytial virus, echovirus, coxsackievirus, coronavirus, adenovirus, etc., which are usually self-limiting. When the virus breeds in the body, symptoms of cough, runny nose, nasal congestion, headache, fever, and weakness may occur, and usually recover on their own in about 5 to 7 days. When you have a cold, you should take more bed rest, ensure enough sleep, eat a light diet, drink enough water, eat less greasy, fried, cold and raw food, combine work and rest, and take appropriate physical exercise gradually, and consult the relevant doctor if necessary.