The duration of modafinil's effect depends on metabolism, dosage, and tolerance. Modafinil acts for 12–15 hours after consumption. Its long duration allows for continuous alertness and cognitive stimulation, which is useful for learning or working on difficult tasks. Within 2 to 4 hours of intake, modafinil may increase alertness, focus, and cognitive performance. Modafinil doesn't replace basic study habits including rest, nutrition, and time management.
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