To be eligible for the Project Management Professional (PMP) Certification Exam, you must have a total of 36 months of unique project management experience. This means that any overlapping time periods where you were managing multiple projects simultaneously should not be included in the calculation. Each month of experience can only be counted once, even if you were working on multiple projects during that time. For example, if you managed two projects from January 2021 to December 2021, you would only count 12 months of experience, not 24 months.