Easy!
1 - For consumer items not covered by a reasonble warranty period, Take the manufacturer's specified MTBF and divide by 1,000.2 - For items covered under warranty, just add 30 minutes to the expiration date of same.
3 - And for cheap Chinese imports, just add up whatever time it takes you to open the packaging.OK -- I guess that was just a wee bit cynical. :)
...=20
with
luck!
aBasically it is the _statistical_ point where the root sum square failure= rate=20 of the individual components becomes 50% probability.
Note that for the often used exponential distribution (applicable for a constant failure rate), we will then have the reliability at time t as R(t) = exp(-t/MTBF). So the probability that any one component actually survives to its MTBF is only about 37%.
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