Cumulative time required and total number of joint detections for Rubin follow up. Left panels: cumulative time necessary to follow up all the events in the Rubin footprint with a sky localisation smaller than Ω₉₀ (indicated in the x-axis) for ET-triangle as a single observatory, and included in a network of current and future GW detectors as indicated in the legend. The horizontal dashed lines indicate the time corresponding to 10%, 50%, and 100% of Rubin's total observational time in 10 years. Right panels: the corresponding number of optical detections by Rubin. Solid lines are for the KN emission, while dashed lines are for the KN+GRB afterglow. All plots refer to the BLh EOS; the top row plots are obtained using the uniform NS mass distribution and the bottom row ones for the Gaussian NS mass distribution. Thick lines represent the fiducial population (α = 1.0) whereas the thin lines represent the pessimistic population (α = 0.5).