And that's assuming none has leaked out, and all the old oil was drained before new was added last time, and ....., and ....., and .....
Well, you get the idea. Best to start fresh with new carefully measured oil amounts before taking any measurements.
Accepted practice is to run the oil about 6" from the tops of the tubes, measured with the springs out, forks compressed. The stock amount (just under 6 ounces) will put the level at a rather low 9" to 9 1/2" down. My 7 ounces is a bit of a compromise and places the level about 7" down. Each additional 1/2 ounce of oil will raise the level about an inch.