script remaining time without login

hi all,
i would show for 4 users on my hotspot webpage the remaining time for each users .
so today the only way for me is to check the router or with the status page .
but the status page work only for the user logged.
so i will show a web page with fixed users list ( 4 users : free1 , free2 ,…) and the remaining time for each user.

someone could help me ?

Best Regards