Ceremorphosis lasts, at most, 7 days. Unless the game resolves its entire plot in the span of a couple days, that can't be the whole purpose of the adventure.
This would also lead to interesting gameplay, if a real day-night cycle is implemented (if you lollygag for 7 days it's game over)
I can see the PCs going to a small-time healer in Act 1 who will give them some kind of potion or serum which will delay the ceremorphosis for a 'plot protected timeframe' so that it's not a real ticking bomb but a pure plot device.
At the same time, I can expect the ceremorphosis on your character to develop and progress as you reach certain milestones within the game.
