One wonders how they figure this out. I am a frugal photographer and in the past ten years I have shot about 60,000 images. I think the duration, on average, was 1/60 of a second each shot. If you do the math that work out to 17 minutes of picture taking. Of course the set up was a lot more complicated and that time covered about 10 years!
For a camera they would only check how many exposures were made. Though on the same page it states that they take returns up to 15 days after purchase. I think the verbage about minutes of use and exposures is just in there but seldom used.