How long is the monitoring of residential property generally retained?

Community surveillance videos can generally be kept for about a month. Property companies will pay more attention to the monitoring of entrances and exits, that is, the places of entrances and exits should be preserved for a long time. However, the monitoring inside the corridor, the property company will consider the cost, and generally the retention time will not be particularly long. The actual situation has to consult the operators in the property monitoring room.