That 200k milestone isn't very hard to reach. I'm only playing once every 2 hours with my top team. Need to try to do at least that for every 4* arena.
The difficulty ramp is tough for me... I just ran my top team ( 2 3/30 4*, 1 4/40 3* ) at win streak 8 or 9 and faced 3 3500-4000 champs. Red special'd from near full health to dead in 2 of 3 matches.
I run about 75-80k / streak. Hitting 200k is easy, but I want to get a few milestones. I can reasonably get the 600k, but 1 million is more time than I'm willing to spend as my teams stand now.