I do close to all of my studying through an application called Anki.
Anki keeps close track of all my data to every last little detail.

I have extracted how many days I’ve studied at all: 145
vs how many days I have not studied at all: 122
in order to visualize if I really study as much as I think I do or not.

This is the data taken from this year so far (267 days into 2023)

Shared By: Anonymous
Source: The personal data in my Anki application, not linkable
Image Alt Text: Days studied Japanese vs days not studied Japanese