48 hours

I agree with Zerostats. Ask him if he is downloading something. I see no other reason for leaving it on. Some people do put it on low power mode, but myself, I turn it off.

Sometimes, there are things that needs to be done that requires longer hours like defragmenting, I'm not sure of the term. Maybe that is what your husband is doing sometimes that is why he is not turning it off. Well, personally, I am using my netbook so I would turn it off when not in use. Have a great day!

I have a desktop and a netbook. My computer technician told me it is better to leave the desktop running and better to shut down the netbook when not in use. Netbooks are prone to overheating, and sometimes desktops are too but only if the fans aren't free of dust and whatnot. Constantly turning the desktop computer on and off can cause significant damage. You can put the desktop computer into sleep mode, which means the computer is still on, but that it's conversing energy. As said I've left my computer on all the time, and my electric bill never went up. But this is where I live, and it may be different than where you are concerning electric prices. Here is a link you can check for yourself on the pros and cons of turning the computer off or leaving it on. Hope it helps! http://www.howstuffworks.com/question328.htm

Hmm looks like he is downloading/or uploading something from/or over the internet.Why don't you ask him what exactly he's doing on his computer?

I think your computer also need some rest for sometime every day. Otherwise it might get damaged early

Wow, 48 hours is a lot! I turn off my computer whenever I'm not using it. Otherwise it annoys me...and I'm too tempted to use it again:p

I think you shall ask your husband why he needs his computer to be on all the time. He must do something important. Just like a few weeks ago I tried to recover the data and therefore I really needed my computer on all day long. I especially told my family not to touch my computer since I had something important to do. And these few days my computer is still on since I am downloading stuff.

he should not be letting it run for that long. Your computer might overheat.

I think you are right. yes, we have to avoid some useful activities. But, try to ask your husband why he do this? Maybe he has certain goal keep his computer turn on for long hours. Everything is okay as long as based on logic reason.

Yeah, it is better to off it when not in used. As the CPU may be heated up . Perhaps you may check with him before you off his computer in future as he may be downloading some files which need time .