Even if the rest of the day is a write-off, there's always something that is within your control that went well. You did 2 minutes of language learning, reading, drawing or other skill development. And it's not nothing either: 2 minutes per day adds up. Maybe some days you do 25 minutes or an hour. Now it really adds up fast.
Consider that most of your peers spend 0 minutes per day on deliberate skill development.