Well, there are times when you will run into homework that is just too long.

If you do the assignments as you mention in your comment, you will usually end up not understanding much of the lesson content.

Since each section of the homework is somewhat different and doing them without intermissions of something else will make your mind scramble.

It is better, in my opinion, to take a "drawing time" to do the homework, and the next time to draw the 50/50 rule.

That way, you will never feel fatigued by how long the assigned task may be.