I try to keep them up 24/7. But I face a variety of issues in getting good s@h wu production out of them. A lot of students don't seem to know how to "log off" when they are done; they shut them down. I'm going to prepare a memo for the instructors about this -- not just to improve the s@h wu output, but because it inconveniences the next student that has to wait through a lengthy NT bootup to use the machine. They also dual boot into Win98, and I don't have s@h installed on the Win98. But the students are not supposed to be using Win98 normally. Too many are, and I need to address that with some lab policies also. Finally, the hard drives are removable, and get taken out during some classes during the day when students use hard drives that are issued them specifically; so I'm not getting any s@h wu production during those times.