[orca-list] How to force Linux so it will never stay computer as idle

["Mgr. Janusz Chmiel" <ernesta tiscali cz>]

Dear,
I would like to know, if it is some hack, which will force Gnome or may 
be Linux kernel modules so computer will never stay as idle. Because The 
maximum idle time is 120 minutes. I would like to set this value for 
example to 12 hours, if it is no possibility to set this value to 24 
hours for example.
I think, that Gnome component is responsible for this task. Or can i 
solve this by simply denie Gnome power manager app to run automatically 
with Gnome? I hope, that this behaviour is not build inside Linux kernel.
Thank You very much for Yours answers.