According to the data of ZTO Express, it usually takes about 3 days for express delivery from Heyuan City in Guangdong Province to Yichun City in Jiangxi Province. The state stipulates that express delivery in the same city shall not exceed 24 hours, and express delivery in different places in China shall not exceed 72 hours. According to "Postal Industry Standard": timeliness, the delivery time of express mail shall not exceed the service time limit promised by express service arrangement. Service time limit, express service time limit refers to the time distance from the arrangement of express service to the first delivery.