Can't complete first episode quest

Do the episode quests continue until finished or do they close after 24 hours? If they close, how are we supposed to "win 5 marquee battles" when there are only 3 marquees battles available today? I am only offered 2 Huyang tiers (because he's 3*), and 1 Padawan Sabine tier. And we aren't able to replay these battles until tomorrow, but I'm assuming the episode quest will be over by then.

Of course, I could hurry up today and pay to upgrade my Huyang so that he is 5* and has 2 more tiers to play which would give me 5 battles. Maybe this was the intent?....to paywall the episode quests?