Captive Portal

Hi all, new to this system/forum here.

I set up easily a wifi hotspot system with monowall

I use the only voucher system for authentication  (not single user accounting,  the hotspot customer will receive a coupon with wifi SSID, WAP key and voucher code - is it an affordable solution ? )

As per manual , the first time the voucher is used , system starts the voucher time to expiration until it ends, even if the customer is not using it or he is disconnected.

Is there a way to pause/stop this countdown to preserve the time usage ??
Most of commercial systems have a "disconnect"  popup page to stop the counter.
Think at the customer paying a "X euro per  hour" voucher,  he wants to pay what he's using .....

Any suggestion

Thank you very much.

Are you sure that the built in popup blocker in the browser is not blocking the "Logut" window ?