The question is, do we want the time to WoC from starting char to be the same, or just the over capping?
Assuming PEs gain xp at 80% (it was a figure I remember from years ago but I'm not sure how accurate it is) the rate of the other classes (factoring in ability to use higher TL weapons), then the former would simply be 80% of the total xp (206m xp) and the latter would be cap plus 80% of the over-cap (24+80=104m xp).