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This implies that the YMCs must have gone through at least one full crossing time before their presently observed age. Using the crossing time equation, $t_{cross}=(GMr_{vir}^{-3})^{-1/2}$ and fixing the crossing time to 1 Myr we can solve for $t$, which is only dependent on the mass. \cite{Arce_1999}// \cite{Arce_1999}\\