They may not show the Queen trade the curse with Maleficent this season. I think that we are going to only get to the poisoned apple and the scene where Charming kisses Snow awake at the coffin and maybe a little bit more by the end of this season. There could be years between that moment and the curse. We know that there are at least 9 months because Snow gets pregnant and has Emma, but there is no reason that it couldn’t be longer. It could be years.