Practise the thinking. Keep the judgement.
How long does it take to learn Japanese? JLPT hours by level
How long does it take to learn Japanese? JLPT hours by level | RubricMark
JLPT N5 takes about 325 to 600 study hours; a working level about 2,200 class hours by FSI. See the hours for N5 to N1, divide by your weekly pace, and start with daily cards and a JLPT practice test.
Related learning
RubricMark is the AI — practice questions first. Ronri is exam prep on iPhone. Optional timed sits cover JLPT, OET, GAMSAT, LNAT, TARA, and AU selective papers. Marks after you write.