+1 I am a big proponent of physical writing. I know others get the same benefit from typing but for me the writing of the cards makes all the difference. I keep them to run through when I have time to kill to keep fresh on topics as well.
One hour travelling time on train/bus or car? If public transport: use that travel time! Listen to some classical music (or whatever else doesn’t interfere with your ‘brain waves’) on noise-cancelling or in-ear headphones and read those books. One hour a day is super valuable. If car: maybe find a way to use public transport instead…?