I have 3 weeks to visit beijing, shangai, guilin, suzhou & huangshan. How many days in each place?

3 weeks are enough for you to visit most of the important attractions in these cities. Three to four days are spending in Peking, Shanghai. If you go to Guilin, Yangshuo is suggested to go, so you still need about three to four days. Two to three days are used in Suzhou and Huangshan.