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https://serverfault.com/questions/1041661/s-m-a-r-t-lifetime-hours-resetting-to-zero#:~:text=On%20the%20other%20hand%2C%20the%20LifeTime%20%28hours%29%20value,minutes%2C%20SS%20is%20seconds%20and%20msec%20is%20milliseconds.
https://unix.stackexchange.com/questions/177846/in-smartctl-output-what-does-lifetimehours-mean
For example I have two drives where LifeTime is a uint16 and rolls over after 65535 hours. sudo smartctl -A -l selftest /dev/sda | egrep '(Power_On|# 1)' 9 Power_On_Hours 0x0032 022 022 000 Old_age Always - 68380 # 1 Extended offline Self-test routine in progress 80% 2844 -
https://serverfault.com/questions/1041661/s-m-a-r-t-lifetime-hours-resetting-to-zero
On the other hand, the LifeTime (hours) value reported for self/short/long tests seems to wrap at ~49 days, similar to how SMART error reporting works. From smartctl man page: This is displayed in the form Dd+HH:MM:SS.msec where D is the number of days, HH is hours, MM is minutes, SS is seconds and msec is milliseconds.
https://www.tenforums.com/tutorials/163843-how-check-drive-health-smart-status-windows-10-a.html
"By default, the total expected lifetime of a hard disk in perfect condition is defined as 5 years (running every day and night on all days). This is equal to 1825 days in 24/7 mode or 43800 hours." On some pre-2005 drives, this raw value may advance erratically and/or "wrap around" (reset to …
http://www.cropel.com/library/smart-attribute-list.aspx
The value counts down, typically from 100 to 0. The Raw value often holds the actual number of hours. 241: Total LBAs Written: The total number of 512-byte sectors written during the entire lifetime of the device. 242: Total LBAs Read: The total number of 512-byte sectors read during the entire lifetime of the device. 250: Read Error Retry Rate
https://www.thelightbulb.co.uk/resources/light_bulb_average_rated_life_time_hours/
In the light bulb industry, the lifespan of a bulb is referred to as “Average Rated Lifetime Hours” (ARL). Average rated lifetime hours indicate how long it takes for a certain percentage of light bulbs in a test batch to fail, and are measured and labelled using hours and an “L rating”. For example, if 100,000 bulbs were tested and 70,000 bulbs (70%) failed after 1,000 hours, this bulb would have an …
https://www.reviewed.com/televisions/features/how-long-should-a-tv-last
The average lifespan of an LED at maximum or close-to-maximum brightness is 40,000 to 60,000 hours, or 4.5 to 6.8 years. For sake of ease, let's say it's 5 to 7 years, with the understanding that you aren't watching TV for 24 hours a day (I hope). In fact, it's around 13 years at eight hours a day, which isn't anything to sneeze at.
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