How can I log a host or number of hosts and their duration of use per day ?

Question

I have a large number of staff that we want to monitor their time spent in the office based on their mobile phones connecting to our wifi, or their PC connecting to the wifi / network. 
 We know the mac addresses of each device, and have specified reservations for each device, but I am not sure if such a report exists, to know when the device negotiates for DHCP, and when the device has been lost from the network ? 
 Any thoughts would be appreciated on how to generate such a report. 
 Running XG v16. 
 
 Thanks

Aditya Patel · Answer

Hi Jeff, 
 We do have a limitation on web filtering based on MAC addresses, You could take the reports based on username/ host addresses. , you may not get the logs for time spent on your network . you could manage accounting for your users but that would be for user based rules not mac/ip based rules. 
 If you know the MAC addresses , we would advise you to configure Static DHCP with MAC-IP pair , this would enable you to keep track of the devices based on host addresses.