Cool! I'd pick up my kids earlier and maybe learn to weld or sew.
One of these you can safely do while watching TV or at a ball game.
I highly recommend picking it up if you ever have down time like that!
Learning to weld has actually augmented how I conceive system designs.
Fun fact: a previous company I worked for denied my request for a 4-day workweek precisely because they were scared I'd work another job. I honestly just wanted more time to ride my bike.