Quick vocab review tips for busy weeks?

Hey guys! I'm super pumped about learning lately but this week is going to be so busy. I usually spend a long time on vocab but I just won't have it. What are your favorite tricks for super fast reviews when you're on the move? I was thinking maybe flashcards on the bus could work. Does anyone have a "main" routine that works in under 10 minutes? I really dont want to lose my streak!