Radial profiles of characteristic timescales in the disk. The red and blue curves show the time-averaged viscous timescales for α = α_c = 0.05 and α = α_h = 0.5 disk regions, respectively. The horizontal dashed line marks the mean mass-deposition timescale τ_dep at the characteristic deposition radius r_dep (vertical dashed line). The horizontal dotted line marks the global mass-deposition timescale, τ_{dep, global}=$M_{\mathrm{disk}}(t=0)/{\dot{M}}_{\mathrm{dep}}\approx 125$ yr.