>>15293
Bad for fans maybe, not gonn ahurt much else provided its cooling properly. I have a 18 year old thinkpad I bought used about 6 years ago and I run it 24/7. Fan has shit the bed but only cost like 7 bucks to replace. The only things I would be worried about are cheap stuff and things with terrible thermals. but if it's cooling properly should be no issue running it all the time.