Crossing timescales from the zero point, set at log T_eff = 4 to allow comparisons with all previous works, to the point of maximum effective temperature in the HR diagram; i.e., the so-called knee of the evolutionary tracks shown in Fig. 8. Timescales are shown for all the sequences presented and the H-burning post-AGB sequences available in the literature, i.e., (Vassiliadis & Wood 1994, VW94); (Schönberner 1983, Blöcker 1995a, B95+S83); and (Weiss & Ferguson 2009, WF09). Crossing timescales of the new sequences (this work and also Weiss & Ferguson 2009) are much shorter than the crossing timescales of the H-burning models of Schönberner (1983), Vassiliadis & Wood (1994), Blöcker (1995a). The sudden decrease in τ_cross at M_f ~ 0.58 M_⊙ (Z₀ = 0.02, 0.01 and 0.001) can be traced back to differences in the previous evolutionary history of the models (see text). Because of slightly different definitions of the zero point, the numbers do not completely agree with the value of τ_cross given in Table 3.