Why reading interventions are more effective with longer durations, such as 30 minutes or more

I need help writing a paper on this topic: 1. Why reading interventions are more effective with longer durations, such as 30 minutes or more 2. Why do reading interventions are more effective for younger children than older children? (ex. Kindergarten versus middle school children) 3. Why is being at-risk in reading in two languages, like Spanish and English can make reading interventions ineffective.

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