cybercafe system

[Mihamina Rakotomandimby (R12y)]

Hi,

Here in 3rd world countries, internet is still luxury.
I would like to setup a cybercafe (or cybercoffee?) which is a place 
with several computers and people can surf and pay the time they use the 
computer.
I would like then have the ability to count how much time (minute 
precision) an account has been logged in.
Most of the cybercafe I have seen is pre paid, so the real need is a 
countdown and then a forced logout when expired.

What kind of ubuntu integrated solution can be used?

Dont worry, it wont be expensive for the users ;-) it will just be a 
symbolic amount.

-- 
Chef de projet chez Vectoris
http://www.google.com/search?q=mihamina+rakotomandimby
System: xUbuntu 8.10 with almost all from package install