I'm looking to use m0n0wall on my Hotspot controller as it does everything I need, but in a 
lightweight package.

The captive portal is great, however what I would like to know - is if there is a way to make it 
so, once a user has had say, 1 hour of access - they can't have anymore, without having a 
new account.

I've noticed there is the expiry function on the usernames bit, but this allows for 24 hour 
blocks as is on a day basis, instead of a hour basis.

Has anyone got any ideas on how I can make the account expiration feature more exact?

Thanks in advance,
Rob.