Doing Homework in Class Many times a section of material must be practiced for a long period of time before it is absorbed to the point that a teacher can add to it. Usually the teacher gives the student homework to provide this needed practice and time to absorb and firm up the concept in memory. Under block scheduling, the teacher will need to do this in class before going on to the succeeding topic. Students will be using class time for homework instead of instruction. Over time this will limit the quantity of material covered.
All year long is better for some things.
For some subjects it is better to have instruction all year long. In instrumental music, it is better for the instruction to continue throughout the year. Musicians benefit greatly by long hours of practice between lessons. Receiving lessons consecutively without the long hours of practice between instruction is futile.