Theory of the countdown

my First theory was that the countdown was to when they both would convey their feelings to one another and be in love! so Im guessing thats it? Not only that but I think more importantly it's a countdown to accepting oneself, They both accepted who they are what they have been through and once the timer ended, they are ready to let go of past trauma and finally feel love and turn over a new leaf in their lives! It's very sweet <3