Why short sessions work
Fifteen minutes is easier to fit into your day than a large study block once a week. Regularly returning to the material reduces the load on your memory and helps you spot weaknesses earlier.
The goal of a short lesson is not to close a large topic, but to take one measurable step: remember phrases, answer a question, or correct one mistake.
Lesson structure
Spend the first five minutes reviewing. The next five are new words or phrases in context. The last five are for one voice answer to the question.
If you have more time, don't drag out each step forever: add a second answer and compare it with the first.
How not to lose rhythm
Link the activity to an existing habit: coffee, commuting, or finishing the work day. Keep the plan small enough that it can be completed even on a busy day.
Skipping does not require starting all over again. Just go back to the last short step and continue the sequence.