On an average it takes one to two months to complete the whole process from your application to the commissioning of the rooftop solar system. However, the real time depends on the state where you live, the proactiveness of the electricity company (discoms) in the region in granting required permissions and the service quality of your solar vendor. In some states like Gujarat, where the whole system is faster, the connections are done within 20 days to one month. We need to keep in mind that in rooftop solar connections, while the solar installation will be done by the vendor, electricity companies handle the issue of installation of net-meters, its testing and final commissioning.