It is your child's responsibility to do their homework.  As long as they are working hard and persevering, you can add a note if they could not finish in the allotted time.  These time frames are in the district handbook and posted below this message.

The fourth grade team is more than happy to help them with concepts they are still learning.  However, homework is supposed to be review and practice of what we teach in class.

Copied from District Handbook p. 15
Guidelines for homework:  For children in the primary grades (K-3): average of 15-30 minutes;  For children in the upper elementary grades (grade 4): average of 45 minutes;  Also, an additional 20 minutes of reading or being read to.