Dependence of e-folding time as a function of stellar mass. Upper panel: Variation of e-folding times of bulges τ_bulge (red) and discs τ_disc (blue) as a function of their corresponding component stellar masses. The stars represent the median value in each mass bin, and the error bars show the 16th-84th percentile range in the spread of values in each bin. Lower panel: Similar to above but with the total galaxy stellar mass along the x-axis. In both panels, the τ_bulge was shifted by 0.05 dex for clarity in visualisation.