It can be completed in one to three months, and the expansion is very troublesome. This is a question of engineering planning. If there are enough new residential areas nearby, the expansion can only be carried out with planning. Without planning, when is uncertain. The so-called expansion means that the local access is full, just like a switch, he only presses an eight-port switch, but now the ninth household can't connect, so he has to take another route (eight-port switch). What is involved here is not enough, but also involves the planning of other bureaus.