I hope I can answer your question if you start on day1 of storybook you are given 10days to complete... if you start on day2 on story quest you are also given 10days to complete but it will end on day12.
the left icon you mention will always be there for 10 days the last day you will have a timing on the last 24hrs.... so your question if Example I start on day1 but I did not do anything even I am on chapter 1 act1 I just leave it un-touch for 10days .... on day10 I should get a prompt saying hey cocauina do you want to buy Airy Otter??? last chance please click on 2200gems to buy it..... but I did not get this prompt msg so Airy Otter should be in my storage although I am on chapter 1 act 1.....
well if you msg S8 & they give Airy to you please msg here because I can save my apples for storybook in future :0