If I Fail the PMP Exam, How Soon can I Retake It?

PMI does not mandate any "cooling off" period to retake the exam. You can retake the exam anytime provided:

1. You apply for re-examination and pay the reexamination fee. Normally, it will take about 3-4 business days for your previous exam result to be registered in PMI's systems. So, you'll have to wait until your previous result is recorded in their systems before applying for re-examination.
2. You book the exam slot again with Prometric.
3. The new exam date is within the one-year eligibility window.