how deep of penetration can you get on punky wood and say dry maple? Just looking for a average.

Penetration is a function of time and vacuum.  If you achieve full vacuum until the bubbles stop coming from the wood, then allow the blanks to soak at atmospheric pressure for a minimum of twice as long as you pulled vacuum, you will get complete penetration regardless of the size of your piece.  Larger piece will take longer under vacuum though.