Zend certified PHP/Magento developer

Shutdown timer when I start my computer on specific days [closed]

I want to minimize my time infront of the computer, so I thougt for myself why not limit my time infront of the computer with a command like -s -t 3600, I tried this command in Task Schedule but than it is the 3600 sec the whole week and I want 1h computer time Mon-Thu and 2h computer time Fri-Sun. Is there a way for me to make a shutdown timer when I log in to my computer?