I keep saying ‘days’ yet these modules are levels. On level 23 people consider sustainability. How much at risk are they of dropping out? One way to strengthen the language habit is to engage in ‘situational practice’.
Me, I write 100 words first thing in the morning. I follow that up with some language practice—usually—and in the evenings. But there’s room to attach various other activities to different times of the day.
Listening lends itself to driving and walking. A Kindle is good to carry and pull out at odd moments. And you can leave a book anywhere.