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Some defenders say:

| Grade Level | Optimal Homework Length | Actual Average (US) | Effect on Achievement | |-------------|------------------------|--------------------|-----------------------| | K–2 | None recommended | 20–30 min | Zero to negative | | 3–5 | ≤ 30 min | 45–60 min | Very small positive | | 6–8 | ≤ 60 min | 90–120 min | No improvement | | 9–12 | ≤ 90 min | 3+ hours | Diminishing returns | Homework Is Trash.ml

Just as copying a friend's homework doesn't help you learn, letting test data leak into training creates a model that memorizes rather than understands. Project-Based Learning: Some defenders say: | Grade Level | Optimal