34 1/4 from the bottom of the topper ,, the part that stops on the tube ..just above the o-ring34" from the top stopper (where it touches the top of the dipstick tube) to the tip.
If you were to put a mark 33" from the top stopper towards the end of the stick, THAT would be the correct spot for FULL with 8.5 U.S. Quarts in the pan.
Cheers