[1.8.1] Captive Portal - timeout settings with vouchers not required?

Hi all,

1.8.1 running smooth as silk here. Well done to developers and contributors.

For those using vouchers with Captive Portal, is there any need to have 
a hard timeout configured?

If I understand it correctly, the voucher system will remove the user 
from the users list at the expiration of the voucher, so theoretically a 
hard timeout will never be reached (unless hard time out is set to less 
than the voucher time limit). However, doing that would override the 
point of the voucher's time limit, so can be ruled out.

Therefore, should the 'hard timeout' be set to blank for voucher 
configurations, or is it best, for example, if the voucher is 60 
minutes, to set a hard timeout (e.g., 90 minutes) as a safety net?

Thanks for any input.