Hey!
The question you have asked is kind of vague as you have not specified for what you are asking about the time duration, that is, whether it's exam or class. Moreover, as you are in 9th standard. you will get information like exam timings or classes timing or schedules from your school itself. However you may write in the comment section as to what you were referring to in your question.
Regular exam updates, QnA, Predictors, College Applications & E-books now on your Mobile