I play on a Samsung Galaxy S9+ If it's a day off, probably 3-4 hours, but I'd say at least 1-2 hours a day. Especially if I get all 3 boosters while completing quests.
My favorite level is one I beat on my first try without any boosters of any kind. If I have to give a number..... 1000. It was a fun milestone level. Nearing level 1700 now. Looking forward to 2000