I studied Elec. Engineering. Depending on the specs., many components are tested to limits far beyond what they will ever see in simple transit or daily use (they do not want costly returns!). For military applications, you can more than triple the durability numbers. Electronics are routinely frozen, heated, shaken for days at a time on test benches, etc. Even auto components are "cycled" with actual counters (e.g., windshield wipers- avg. is about 2.5-3 million on modern cars). Manufacturer knows almost to the month when the compenant is likelty to fail aka planned obsolescence (hint, it is after the warranty period is over!). With these products though, if you take care of them (heat and humidity are the main factors), they will last a very long time. You will likely want to upgrade for your own reasons before they ever fail on you.