Child (4-9 years old) - 1 hour a day
- Persevere 1 month+
- Reading picture books, watching TV, writing homework, etc.
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Adolescent(10-18 years old) - 2 hours a day+
- Persevere 15-21 days
- Class, writing homework, reading, walking,etc.
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Adult (18-50 years old) - 3 hours a day+
- Persevere 15-21 days
- Daily office, reading mobile phones, walking, reading books, etc.
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