The duration Modafinil (Modalert) stays in your system varies based on factors like dosage, metabolism, and individual health. On average: Half-Life: Modafinil has a half-life of about 12–15 hours, meaning it takes this time for half of the drug to be eliminated from your body. Complete Elimination: It typically takes 2–4 days for Modafinil to fully leave your system. Factors...