When I was a young pianist, practising 6-8 hours a day, I would do this one exercise a day, for about 20-60 mins. This exercise helped me to know my chords back to front, understand the modes I was using and develop my creativity and my performance chops.
Hope it helps.
Let me know in the comments below how it goes for you.
Chat soon,
Glenn
Feel free to buy me a coffee over at https://ko-fi.com/glennseddon