Can't get past the 20-minute daily habit; how should I structure my session?

I’m a busy professional and only have 20 minutes a day to dedicate to my Xhosa studies. I keep bouncing between vocabulary lists, grammar charts, and listening to Xhosa radio, but I feel like I'm not gaining any real momentum. What’s the most efficient way to use these 20 minutes so I don't feel like I'm starting from scratch every single day?