The maximum value for the Voucher increments

Zyxel_Judy

Vouchers can be set to specific time increments to limit access to users who you authorize to use the network for a specific period of time.

Duration (hours):

Sets how long the voucher is valid after it has been activated, in hours.
The valid range for this setting is 1 – 8760.

Purge after (days):

Sets how long a non-activated voucher is valid for, in days.
The valid range for this setting is 1 – 180.