You can set the script timeout in the IIS Service manager and change the ASP Script timeout to however many seconds to 43,200 seconds. Is this what you want to do? Are you running some batch job you have written in an ASP or what?
I guess I am confused. What client information is timing out? The only information you pass to a client that times out is cookies. Where is this Session variable declared is this in you .asa file or in your page or what?