I study with a set routine. I do my language learning practice at the same time every day for 15 minutes. On days when I feel I can concentrate better I do 30 minutes. I combine visual (duolingo), auditory and movement (listening to podcasts while taking a walk). I keep in mind, the goal not of mastering the language, but of not breaking the chain. With this method, I have studied every day for 1348 consecutive days.

Wow, sounds like you've found a great system!