It feels like I'm always doing work.
But on weekdays I finish homework at 6pm to then follow on revision or research for the next hour.
Though, I have quite a few frees in my day so I use those to do work as well.
That's just what I've found works for me. Experiment and see what is most effective for you. Maybe try a new technique in your working habits? Do you make the most of your frees?