Left: four realizations of the time evolution of the true SFR (SFR_real, dashed line) and the SFR measured using the total number of YSOs and an average lifetime for all Classes. Each clusters has N_* = 500, a Milky Way-like IMF and a constant SFH. Right: similar to the left panel, but here, each cluster has N_* = 500, a Milky Way-like IMF, and a Gaussian-like SFH. The Gaussian’s peak is at 2 Myr and the standard deviation is 1 Myr.