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As mentioned by others: A reasonable time is set by law and depends on the price of the product; 3 years for a laptop is normal but for a (new) house the warranty period for construction errors may extend to 20 years.
I never accept those extended offers; If you have a bad device and it breaks within the reasonable period that you may expect it to work you don't need the extended warranty. If you expect to beat the insurance company at a game they set up themselves you might be better off gambling with the insurance premium in a casino.
Ok, so when Microsoft steals chinese code it must be Microsoft chinese doing the stealing, so it doesn't count? Does that myopic trick work with the profits for Microsoft as well, as in "profits made in foreign countries do not count"?