iStudiez Pro can handle X-Day Block Schedule.

For example, you have 8-Day schedule, first day starts on September 1.

First you have to add a schedule for Day 1.

Add a new regular class, set it to repeat "Every 8 working days".

Start Date for Day 1 classes is September 1.

Then, add a schedule for Day 2.

Add a new regular class, set it to repeat "Every 8 working days".

Start Date for Day 2 classes is September 2, and so on.

Don't forget to set a correct start date for each of your study Day.