how do i configure my wifi router for controlled free internet access
in  my coffee shop? The goal is to provide free wifi access for my
customers but be able to limit the tome they spend the time online. I
have a Linksys router.

Hello ostienen,

Thank you for your question.

There are a few options here. First of all, do you want to pay for a
solution or would you prefer a free solution?

If you require a paid solution, you need the griffin box. This will
allow you to charge for Internet access and also give it away in time
limits.
It will replace your current router, saving you electricity costs.

It is available from here in the UK:

Flexsys Griffin Box http://www.flexsys-group.co.uk/broadband-internet-hotel-hotspots/griffin-internet.php

They have American resellers, too.

Alternatively, this company is also a very good wireless hardware distributor.

CybercafePro
http://www.cybercafepro.com/

All of these options come with excellent tech support so you should
not go very wrong with any of them.

Search strategy:
Personal knowledge +
flexsys griffin box

If you need any additional clarification, let me know and I'll be glad
to assist you.

--keystroke-ga

You will need more then a linksys router to be able to control
duration of time on an open WIFI network.

You basically need a server or desktop computer to run a monitoring
software or proxy like these:

http://www.cybercafepro.com/
http://www.antamedia.com
http://www.mycafecup.com/

I did find an article that would allow you to upgrade your router
(Depending on the model) so that your hotspot could join the "Boingo"
Hotspot network.

http://www.wi-fiplanet.com/tutorials/article.php/3345991

The best way is to have a Linux box connected to the wifi and run
Chilli spot with  free radius in that. This will help you control the
users.

Hope this works 

Kishor

Please note that its of free and you can modify that to meet your requirement