Thanks Vijay…. The duration could vary depending on the species is what I have read..generally, these common species could emerge once a year or once in two years and not really synchronized, meaning, not all of their brood emerge at the same time. It gets spread over the year. However, there are other species of Cicadas, referred to as the ‘Periodical Cicadas’, which as you said, have a longer cycle, some in the range of 13 to 17 years !… and they are synchronized, all of them emerge together…..
Really, an interesting adaptation…. 🙂