Do students spend too many hours studying?

Good afternoon everyone ,may I introduce myself my name is Yoshi. l am very great to be here with all of you. ladies and gentlemen, now I would like to talk about the students are used to working hard in academics. Nowadays, most parents pay for extra classes for their children after school. May not be good for them, to spend time too many hours learning ?
The advantage of extra classes for students can help them to improve their skill and ability of studying. The students will have new friends and share ideas to each other, when they attend the extra classes. On the other hand, longer school days could result in attention to be down and make the extra class time ineffective. For example, when students are too tired ,the concentrate in the last hour of the day becomes useless.
In conclusion, parents shouldn't give your children extra classes after school , but you should pay for everything that them like to learn because l believe that if the children like to learn something that they love, it will help them to develop themselves to be better. so, parents do not need to give their children extra classes and too many hours learning. Thank you.