To maintain your PMP certification, you must earn 60 PDUs during each three-year CCR cycle through various activities such as taking approved courses, publishing articles, speaking engagements, and volunteer work. Registered Education Providers (REPs) offer preapproved courses, while self-directed learning opportunities also exist, allowing for various ways to accumulate PDUs. For every 1 hour of a course, you typically earn 1 PDU, with additional opportunities for earning PDUs available through various professional activities.