You will likely find a week or two where you will take more than planned.
It is the quality of study time you need to worry about not the quantity.
I suspect you had a good first week because the programme is designed to make you feel good in that first week.
You might find it gets tougher - if not reconcile yourself to being brilliant and capable of doing the studies with your eyes shut. Or it might be because the stuff is pretty straightforward which a 4 year old could do.