I got one for Xmas because i have no money it died in a month. I know that's really soon but my old PCs would last about 2 years. By the way i'm talking about laptops.
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for a PC, 5-6 years, more if it's custom built and upgraded. I'd give a laptop about 3 at most. All have lower quality/power parts, and all run hotter than PCs for obvious reasons. Batterys arn't the most reliable power sources, as they have inconsistent voltage outputs, when compared to that of a power supply for a PC. Keyboards can wear, and on budget models the keyboards are shockingly poor.