Can I actually make progress with only 20 minutes a day?

I'm a busy professional working 50+ hours a week, and fitting in Korean feels impossible lately. I’ve been trying to keep my momentum going, but I'm worried my 20-minute daily sessions are too fragmented for actual retention. Has anyone successfully picked up functional Korean on a tight schedule, and if so, should I focus on output tools like Chickytutor.com to maximize that limited time rather than just passive listening?