Now are semester holidays and I am working fulltime. However, in the evenings I study Japanese.
Wanikani takes me around 30 min a day, additional studying is around 2,5 hours per day.
There, I do my Anki reviews and study grammar in a textbook and/or read some manga.
During university times, I did only Wanikani everyday but textbook only on the weekend for around 4 hours in total. During exam phases, this goes down to 1-2 hours.
I try to use my semester holidays where there are no additional assignments as best as I can because I know that afterwards I won’t have that much time.