You are trying to complicate things by comparing 2 dissimilar items.
If you wish to know exactly what time an animal took to run the complete 525 metres , then you have to keep running the tape until that animal crosses the finishing line and then seeing what time has elapsed.

Because most of us don't have access , and don't care to go to so much trouble to set up the software to do this , we find a very close approximation is arrived at using the method Tijuana describes.

You simply being too clinical again here WOOF43.
I'm surprised you actually get anything done at all.
I know when I try to get anything done perfectly , I take ages to finish the task.

I read somewhere once that second best is usually good enough.
And near enough is good enough.
I mean nobody ever gets even one Race in a lifetime perfectly exactly accurately handicapped.

Outside of Victoria they mainly use finishing margins and multiply by a Time factor, some tracks will use .066 or .06 and .07. Victoria is fortunate enough to have tracks that provide the time the dog actually crossed the line. Hence the post

Whoulda thought?
I sure didn't know that.
By taking a few measurements from the FormGuide , it seems to equate to .0625 seconds per length.

Might be different for Staying Races and the Short Sprint Races.