Hey there @Sukanta_Biswas and other new ones welcome to our community!
I suppose it's time I add my answers to the list 1. I play on a Samsung Galaxy S8+ phone 2. It depends on the day as to how long I can spend. Weekdays probably only 1-2 hours. Weekends can range from 4-5+ hours depending on if I have new levels to beat still, or if theres a big event running. 3. I'm at the farthest level available on CCFS mobile currently 1660 waiting room until next Wednesday