Advanced Japanese Learner--how long would it take me to reach the last quarter of the course?

Honestly, I can’t really give you a recommendation, as I’m not one´of those people that have Anki mastered. Remembering the Kanji would probably not solve your problem either, as it doesn’t approach kanji readings, am I correct?

In a worst case scenario, you can use Houhou software to manually add the kanji missing.

Also, there’s a deck made my one of our lovely Anki Masters @polv with kanji post-WK.