How many years did it take Emperor Gaozu to pacify the world?

In 10 BC, Liu Bang was elected as Pei Gong and began to oppose Qin. On February 28th, 202 BC (October in the early Western Han Dynasty was the beginning of the year, and February in the same year was after October), Liu Bang held an accession ceremony in Xiangyang, Dingtao, Shandong Province (now near Cao County, Shandong Province), and designated the country as Han and Emperor Gaozu. A ***7 years.