Reality: Shingle mfrs. warranty the MATERIAL for 25 yrs. (3-tabs) and 30 yrs. (architecturals). They know that the material will last that long. You are unlikely to get a workmanship/leak warranty from an installer for much over 5 yrs. Actually, if it's going to leak, it most probably would have done so withiin the first 5 yrs. Unusually rough weather is the only thing which would shorten the life of any shingle. Mfrs. "lifespan" test their products for worst case scenarios, so saying that shingles last 15 yrs. IN FLORIDA SUN, is an old wive's tale.
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