At this age, length of practice is not as important as consistency. Also, it is important to note that not everyday will your child be ready to learn new material. Work on mastery of material not quantity. The other question many parents ask is whether or not to teach Surah's using Tajweed. Actually, many parents find it helpful to combine the two.
Children have an amazing ability to remember songs in commercials or various children's song.
For many children, the act of singing actually makes it easier to memorize. However, at this age it is important not to focus on the rules of recitation but rather on the content. While the presence of a teacher or parent teaching children the proper method of making salah can not be underestimated, many parents find supplemental materials helpful in teaching their children how to make salah. Every year new educational products are being introduced into the Muslim market. Today, Muslim parents have available coloring books, storybooks, developmentally appropriate teaching videotapes, audio tapes, and computer programs to enhance the learning process.