Redshift dependence of the quenching timescale t_q. The solid black points show the quenching timescales in clusters at different redshifts as measured by Wetzel et al. (2013, W13), Taranu et al. (2014, T14), Muzzin et al. (2014, M14), Haines et al. (2015, H15), Balogh et al. (2016, B16), Foltz et al. (2018, F18). The dashed and dotted lines show the free fall timescales t_ff from r = 2.5r_vir and r = r_vir, respectively, for the Coma cluster. The dash-dotted line shows the molecular gas depletion timescale (t_depl) with redshift (Tacconi et al. 2018), normalized to ∼1 Gyr at z = 0. The red and black ticks show the expected infall and pericenter redshifts, respectively, for the galaxies in this study.