Convergence of H₀ with number of detected events. Bottom: precision on the estimation of H₀ with 68.3% confidence intervals as a function of the number of events detected at each EM level. Here, all events are assumed to be at a given electromagnetic information level, as denoted in different colors. We also indicate the tension in the Hubble constant and the precision on H₀ obtained with GW170817 and counterparts. Top: expected number of years of continuous observation required to detect events in various multimessenger scenarios.