What is the minimum launch interval between aircraft during Case III departures?

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In Case III departures, spacing is set to provide enough time for the lead aircraft to clear the critical airspace and for wake vortices to begin dissipating before the following aircraft reaches the same area. The 30-second minimum balances safety with throughput: it gives the trailing plane a safer interval to rotate, climb, and gain separation from the previous aircraft, reducing the risk from wake turbulence. A shorter interval like 15 seconds tends to be too tight for vortices to move away and for the next aircraft to achieve safe separation, while longer intervals such as 45 or 60 seconds generally slow operations without adding extra safety under typical Case III conditions. Of course, actual intervals can be adjusted for weight classes, wind, and performance, but 30 seconds is the standard minimum in this scenario.