If you are studying for an exam, the first thing I would advise you to do:
Memorise the content table!
You know what to do.
Have your journey, change the items of the content table into a picture, and place them onto your journey.
You may experiment here of having two or even three items on one stage.
Therefore – as a rule of thumb – a journey of 15 – 20 stages can hold a decent sized chapter.
And that is very, very manageable.