Plot of the data latency TL vs. data volume ﹩{ \mathcal V }﹩, where for each value of ﹩{ \mathcal V }﹩ the latency-minimizing mass ratio ζ is chosen. This ranges from about 28 to 100 yr, where larger ﹩{ \mathcal V }﹩ is associated with a larger ζ and a larger TL. TL is decomposed into its three components, from bottom to top: transit time to the star, the transmission time, and the return signal propagation time, all measured by an Earth clock. Latency is dominated by the transit time.