I just bought a second hand laptop for a friend. It’s a Lenovo Thinkpad X60S from around 2006/2007. I have one nearly the same and they were built from very solid stuff.
Poking around in the hard drive SMART information I found an interesting thing:
sudo smartctl -a /dev/sda
Power_On_Hours for the laptop was
4847 (hours). Assuming the laptop is 6 years old and there are about 8700 hours in a year, the laptop has only been switched on for about 10% of its life.
(Or possibly it had a replacement hard drive, but that seems unlikely given the spec of the hard drive matches what I’d expect for the machine).
I ran the same test on my current laptop:
Power_On_Hours = 16361 (hours) and the laptop is around 2 years old, and stays on just about 100% of the time, so that number makes sense.