This may not apply to everyone. Everyone has a different study plan and different goals they are working towards. Here are my ideal numbers that I aim to hit every day for learning Japanese:
・New Flashcards: 50 New Short Sentence Flashcards
・Old Flashcards: 200 Reviews of Old Flashcards
・Watching: 30-60 Minutes of Japanese Videos with Japanese subtitles
・Listening: 12 Hours of Listening
・Reading: 20-50 Minutes of Reading
・Writing: 10 Minutes of Writing
・Speaking: 10 Minutes of Speaking
In my experience: The closer you are to these numbers the higher your likelihood of success!
If you are taking a JLPT Test in July: +20 Practice Problems Every Day