Yeah I just checked, assuming the growth rate is constant (it seems to be), to get to lvl 101 from 66 (my current level) I'd need ~9.32*10^15 shares... so way more than any long stock run can give you, and the earth would be gone way before I could get that at the rate I'm going.

The only way would be having a multiplier so high that levelling up the girls to max level would be fast...
With a +4x share from the ceo item and +13.2x from neon (my current bonus) it would take 1202 runs to get that much share. Of course if it's fast it could be done with more runs with less level ups but you get the point.