in MCA Oral Exam Questions What is the maximum period of validity of a Permit to Operate? by Ship Inspection 19.6k Views 12 months. Share this: See more Previous article When must a new Permit to Operate be applied for? Next article What are the contents of a Permit to Operate a High-Speed Craft? Written by Ship Inspection Leave a ReplyCancel replyYou must be logged in to post a comment.