A modafinil tablet typically begins to work within 30 to 60 minutes after oral administration. Most users start noticing increased alertness, improved focus, and reduced feelings of sleepiness during this time. Peak effects are usually reached within 2 to 4 hours, depending on individual metabolism, dosage, and whether the tablet is taken with food. Taking a modafinil tablet on an empty stomach may lead to slightly faster absorption, while food can delay its onset marginally. The effects of modafinil can last 10 to 12 hours, providing sustained wakefulness throughout the day. For best results, modafinil should be taken in the morning and only as prescribed by a healthcare professional to avoid sleep disturbances and ensure safe use.