How to collect the working capital of hydropower for residential property management is more reasonable?

Generally, it is recorded with the average value of 2 months, and it cannot exceed 3 months at most. The reason is that the energy fee is basically charged on a monthly basis, but there is also a phenomenon of exceeding the month. For example, the extension of the holiday will take one and a half months. At the same time, we should also take into account the special situation of the recipients, and calculate by discount, so it will not exceed 3 months.