Formation time of individual clusters as a function of their mass for each simulation. The top row shows the time between when the first star was born t₀ and when the last star formed t_100%, while the bottom row shows the time between when 10 and 90% of the total cluster mass has assembled. The horizontal dashed line denotes the main sequence lifetime of a 30 M_⊙ star, which is the earliest time a star can deposit energy and momentum in a SN in our simulations.