Optical break frequency (g_P1 band PSD_MBH sample) versus M_BH, color coded with L_bol (top) and λ_Edd, color coded with redshift (bottom). The black error bars are the average values. There is no significant evidence for a correlation with these AGN parameters. The dashed lines in the top panel correspond to the expected scaling of the orbital, thermal and viscous timescales at 10R_S, see text for details.