Dependence of the post-AGB time scales on core mass, based on the relations in Sect. 3.4. The vertical axis shows the time at which maximum temperature is reached. The drawn line (with squares) shows the parametrization, fitted to the 0.605 M_⊙ Blöcker model. The short-dashed line (with squares) shows the result of reducing the envelope masses at the end of the transition phase by a factor of three. The filled circles show the Blöcker model set, the filled triangles models from Weiss & Ferguson (2009), and the open octagons show the locations of A 43 and VV 47.