Comparisons of the r-band timescales on the rise and decline above three flux levels: 20% (t_r20; top), 50% (t_r50; middle), and 80% (t_r80; bottom). The error bars denote 1σ uncertainties, while the underlying blue shaded regions represent the density maps. The light curves become more symmetric around the peak; t_r20,decl ≈ 3 × t_r20,rise, t_r50,decl ≈ 2 × t_r50,rise, and t_r80,decl ≈ 1.5 × t_r80,rise.