Extent
An Extent
noun
The kanji and the word are exactly the same. That means they share meanings as well.
ほど
You'll remember this kanji to the extent that you study it. If you study it like Hodor (ほど) would study it, you won't learn it at all. You would only be able to say "hodor, hodor," over and over again, which isn't helpful at all.
まだ夜明けまでは一時間程あったが、驚く程青い目をした男は既に起床し、珈琲を作り始めていた。
It was still an hour before dawn, but a guy with startling blue eyes already had gotten up and was making coffee.