How long does FRM last?

Could you please clarify what FRM you are referring to? Is it the Financial Risk Manager (FRM) certification program? If so, the FRM certification process itself typically takes candidates several months to a year to complete, depending on their preparation, study habits, and background in finance and risk management. The actual exam consists of two parts, taken separately, and there are no prerequisites or formal educational requirements to sit for the exam, though a strong foundation in finance and statistics is highly recommended. The certification is valid for life, but holders are encouraged to maintain their knowledge and skills through continuing education.