Close to twenty years.
.. Before newegg was newegg they were a brick and morter stor called Egg head. Next door was a Outlet store for QVC (My wifes favorite Channel - LOL) so worked great.
Any way the ONLY problems I've had is Compatability:
1) Older laptops were VERY fussy.
2) Agility III SSD, bought when they first came out would NOT work in laptop (SB) - But then the SF22xx had BIG problems for several months after release.
Failures:
1) With in warranty - Only one's have been a couple of HDD. External that had a little help from Be as I knocked them over when ON - Quess they just do not like the "shock" test.
2) Past warranty - a Couple of MB's. One I attempted to modify a circuit. Another one, the Keyboard port self distructed (well past warranty).
Still have two "shelved" systems that I periodically use - Predates SATA, quessing at least 8->10 years old.
Added:
I'm in the camp that feels a good percentage (20% or >) DOA's and parts that die prematurly are user inflicked.
Also feel ESD is a big contributer. Remeber 1) you do NOT even know (feel) you have a few Hundered Volts charge. ESD can cause what appears to be DOA, BUT it also can cause what are referred to as "Walking Wounded", that fails 1 day, a week, a month, even a year later.