Long-term quenching look back time (t_q, LB) and quenching time-scale (Δt_q) calculated from the nonparametric stellar population age distributions (see Sect. 5.3 for details). Red circles are for CLEs and orange squares are for RQEs. The upper and right panels show the normalized distributions of t_q, LB and Δt_q, respectively, for CLE galaxies (red solid histogram) and RQE galaxies (orange open histogram). The integral of each histogram sums to unity. The vertical (horizontal) lines in the upper (right) panel correspond to median values of t_q, LB (Δt_q) for CLE galaxies in three stellar mass bins: 9.4 <  log(M_⋆/M_⊙)  <   10.4 (dotted), 10.4 ≤ log(M_⋆/M_⊙)  <   11 (dashed), and 11 ≤ log(M_⋆/M_⊙)  <   12 (solid).