Buildup of the smooth stellar disk component. The presence of clusters is measured by the standard deviation of the density fluctuation σ_δ in the disk plane near radius r at time t. The density is measured in pixels of side 30 pc, comparable to the original cluster size. The smooth component becomes significant, with σ_δ​ < ​1, after ∼10 Myr, a few FFB cluster free-fall times, and before ∼100 Myr, several galactic orbital times.