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The intensity and focus and pursuing the same activity for many hours at a time, being uninterruptable during this time, melting down if interrupted, constantly talking to self or others about special interest - these are the key markers of a special interest, not whether your son is interested in WWII for three weeks, three months, or three years.
My son's special interests reach nowhere near this intensity. He'll keep asking to do his project du jour (make a wedding cake, have a yard sale, etc.) until it gets annoying, but it's more on the order of every half hour or so. I questioned the AS diagnosis for this very reason. The psychologist said it was enough for the level of interest to be unusual for his age. He showed a fascination with glass elevators (where you can see the cables and such) at both the children's museum and the doctor's office, and found them to be the most interesting "exhibit" at the museum. The psych said that an engineer like myself might not find the interests to be that unusual.