Does keeping your laptop on for more than 24hrs damage big time?

Turning your computer on and off is worse then keeping it on all the time. Its like a huge shock to the system when you flick that power on. I keep my system on all the time. If however your uncomfortable with that thought, i d recommend getting a couple fans for the inside of your computer.

I keep my laptop running for 24 hours if I'm downloading something big. My room is not air conditioned so I settle for an electric fan aiming at my laptop and not at me. There are times I forget to get the electric fan on then it automatically shuts down even with an external usb fan. Keep your laptop well ventilated if you plan to keep it running for 24 hours or more

I keep my laptop on all of the time. Its more stressful on the system to turn the unit on and off constantly, and to me I'd think that would do more damage then leaving everything alone. I close the lid when it's not being used, and that shots off the monitor, but, that's as far as I go. Closing the lid keeps dust, and other things (in my case cat hair) out of the keyboard.

No problem for me, I keep my macbook pro 24 hrs on!

Keeping it running even when the Lid is shut is bad on the whole for the laptop.The airflow is blocked and it overall tends to get very hot and usually more heat means less efficiency so you can expect your system to act up a lot.The other thing is that like all rechargeable batteries laptops have charge cycles,keeping it on power 24X7 will ruin your battery.The general PCs have around 300 charge cycles and the Li Ions in the Unibodys have around 1000.The thing to do is once the laptop is fully charged unplug and let it drain before plugging the power back in.The battery will also loose its charge retention and you will loose all your mobility on your laptop.I have had my Unibody MacBook Pro for over 6 months and its right now at 130 charge cycles so its well maintained.

it's fine keeping your laptop on all the time, I do it. But remember to take out the battery so it won't detoriate like mine. Just buy a cooling fan so it won't get hot.