Armodafinil-containing Waklert 150 usually lasts for 10 to 15 hours, though each person’s experience varies. Within two hours, many users report a consistent onset, which is followed by extended wakefulness and enhanced alertness throughout day. Because of its lengthy half-life, the effects wane off gradually as opposed to suddenly. Age, metabolism, sleep quality, and concurrent medications are some of the factors that can affect how long it lasts. For some people, taking it late in the day may interfere with sleep because its excitement can last into the evening.