Only have 20 minutes a day—is it better to focus on tones or vocab?

I'm a busy professional and I feel like I'm wasting my limited time on apps that just drill vocabulary. I'm worried that by ignoring tonal markers in my daily practice, I'm just baking in bad habits. Since Hausa relies so heavily on tone for basic meaning, should I spend my entire 20 minutes just recording myself and doing tone drills?