If you’d like to learn another language in your (limited) downtime, the Duolingo app is incredible. It has quick, simple practice sessions that let you accumulate the basics fast. You can set it to how many minutes a day you want to practice, and it tells your percentage of fluency at the end of each practice session. It front loads the commonly used words and phrases, so I’m at 14 percent after only two weeks. So motivational and gamelike, try it!