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A single dosage of Modvigil 200 (modafinil 200 mg) normally lasts 12–15 hours, while some people feel effects up to 16 hours. The first six to eight hours are often the most alert, after which it progressively wanes. Metabolism, sleep debt, tolerance, food consumption, and stimulant sensitivity all affect duration. Modvigil might disrupt sleep if taken late in the day because to its lengthy half-life. For most users, one morning dose of modvigil 200 delivers continuous alertness and mental clarity throughout the workday without severe crashes, but modest residual stimulation can remain into the evening.