Hierarchical Bayesian AMRs for accreted MW progenitors traced by GCs. Left: absolute look-back age versus [Fe/H], with observational uncertainties shown as error bars. Solid lines indicate the posterior median AMR for each progenitor, and shaded regions represent the 68% (dark) and 90% (light) credible intervals derived from posterior samples. Right: same relations expressed in relative time since enrichment onset, Δt = L₀ − t, highlighting the inferred enrichment duration prior to truncation.