The C-P case interview

Hi all,
I have applied to C-P for a position in the factory. Actually, it is related with the planning of the production process. In this round, I was invited to attend the case study interview. Does anybody know what kind of case study it will be? Will it be related with the manufacturing process or it will be closer to the top strategic level?

They told me that they gone give me about an hour to prepare it. Will this time be enough? Is the best strategy to do a skim reading than a detailed reading in order to cope with time effectively?

Thank you in advance.