Work=On from 8AM on Monday - 5:00pm on Friday nonstop
Home=It varies. Off during the day when I'm at work, don't want to waste energy and it gets hot in my house. On in the evenings and on over night if I'm downloading something.
Funny thing you should mention it, in our meeting the other day one of our helpdesk guys managed to convince our manager that the reason so many hard drives are going out in our trianing room (we had 4 out of 10 go out in the last 2 months) is b/c people leave them on at night all the time or shut down the computers improperly....