Whoa!!! That’s intense! (Both the volume of lessons, and how in-depth you study.)
I do my lessons in batches of 5, and do 1-2 of them in a row. Then I spend as little as 20 seconds on an item (an easy, logical compound word/jukugo vocabulary) to as much as 2 minutes on an item, repeating the reading and the meaning aloud while staring at it. I do this again during the post-secondary quiz(es). This ends up taking at most 25 minutes (if I take the whole time for all items + quizzes), and then for any radicals and occasionally other items (where I double check Jisho to see if it’s a proper definition) I also make synonyms on the item pages for things I deem necessary.
If I do that twice a day (which I haven’t in a long time) the most I’d spend on lessons is still under an hour (30-50 minutes).
I rush through my grammar too (when reading Genki)… However somehow turn a 5-7 minute Nihongonomori video into 20+ minutes of note-taking. (Part of it is looking up correct stroke orders to write as neatly and correctly as possible.)