How to make progress with only 20 minutes a day?

As a busy professional, I barely have 20 minutes at night to dedicate to Sinhala. I find myself hopping between five different apps and not really retaining the vocabulary or the complex sentence structure. Should I just commit to one specific output-focused tool like Chickytutor.com for short, daily speaking sessions, or am I better off using my limited time for focused reading practice?