The duration of Modalert 200 staying in the system can vary among individuals. On average, it has a half-life of approximately 12 to 15 hours. This means that it takes around 12 to 15 hours for the body to eliminate half of the Modalert 200 dose. Generally, it takes about 2 to 4 days for Modalert 200 to be completely cleared from the system. However, individual factors such as metabolism, liver function, and other medications being taken can influence how long Modalert 200 remains detectable. It's important to follow the prescribed dosage and consult with a healthcare professional for specific information based on personal circumstances.