Average delay time ⟨τ_d⟩ for each of the 64 BNS population models compared to the median and 90% credible intervals inferred in Pracchia & Salafia (2026). The blue and red lines and ranges correspond to two models by Pracchia & Salafia (2026): a quasi-universal structured jet model and an empirical luminosity function model, respectively. To highlight the relationship between delay times and model viability, we mark with circles the populations that yield a physical jet fraction (with median f_j ≤ 1) under the universal structured jet assumption and use crosses for those that are considered non-physical.