Comparison between two STARFORGE simulations, differing in molecular cloud mass. The fiducial 2 × 10⁴ M_⊙ cloud is shown in red, while the 2 × 10⁴ M_⊙ cloud is shown in purple. The left panel correspond to Figure 4, with points showing the fraction of stars with ﹩\widetilde{{A}_{{\rm{V}}}}﹩ > 1, while the solid lines show the fraction of stars >8 M_⊙, which have begun their protostellar stage. The middle panel shows the same as the left panel, but is normalized by the respective cloud freefall times, τ_ff, demonstrating that the start of emergence is related to initial cloud mass and density. The vertical gray lines correspond to ﹩{\tau }_{50,\gt 8{M}_{\odot }}﹩ and ﹩{\tau }_{50,{A}_{{\rm{V}}}\gt 1}﹩, which denote the time where 50% of the stars >8 M_⊙ have begun their protostellar stages, and the time when 50% of the stars have an ﹩\widetilde{{A}_{{\rm{V}}}}﹩ > 1. These metrics are also shown in the right panel. In both simulations, the extinction is tied to the point in the star-forming event where the high-mass stars form.