How Long Does 30 Mg Of Methylphenidate Last?

How Long Does 30 Mg Of Methylphenidate Last? The immediate-release form of Ritalin lasts about 4–6 hours before person needs another dosage, whereas the extended-release forms of methylphenidate like Concerta may last anywhere from 10 to 14 hours. The half-life of methylphenidate ranges from one to four hours. Is 30 mg of methylphenidate a lot?