it is best to play every day for the daily quest rewards but it's easy to fit it into a schedule. each game takes at most 2-3 minutes of attention, and that is for waiting in queue and team composition. then the battle is done automatically. i'd say generally you have to play 10 games or so to complete a quest.

the game requires skill, but your odds do improve based on collection quality, so investing a bit will get the ball rolling.

i'm a minnow, so i'm slumming in Bronze league for a while, but i'm liking the direction the game is heading in. there are a lot of changes though, so it's hard to predict how things will end up.