Recreationally on a phone...almost zero. Ninety-nine percent of the time my phone is parked unused on a charger while in my offices. I rarely use my phone professionally except when out of the office.
I use two iPads recreationally and would say they are on beside me 24 hours a day while multitasking.
I play hearts and solitaire and crazy eights on a tower comp.
Whoever wrote the hearts pgm did not put much thought into it and it's easy to beat.
Used to play hearts and solitaire on a microsoft pgm. Hearts was hard to beat and was a lot of fun. Then the greedy a-holes decided to start charging for it so don't use it anymore.