How can I estimated the require bandwidth to be reserved for each remote camera connected to NVR?

Due to every IP camera will provide different image to NVR and also request different bandwidth. So, when the IP cameras connected, you can check the IP camera connection status in NVR web page to adjust the IP camera configuration. The maximum aggregated bandwidth for NVR-810/NVR-1610 is 30Mbps (including incoming/outgoing bandwidth). When the bandwidth is over 30Mbps, recording frame rate will be reduced. When this situation happened, you may configure the connected IP camera settings on NVR to reduce the system loading.