It seems quite simple to allocate 10 - 15 minutes in the morning for a piano. At least much easier than to find later time for a longer session during the day.
There is a similar (and very good) "ten minute" question for guitar but most of answers there are instrument specific. Would it be possible to get recommendations on how to use short but daily time for a piano the most efficiently? Especially, does it make more sense to learn new thing or just play the known pieces?