Chapter 6. Commercial Permit Commercial Permit continued Learner's permit exam You will have to take one or more knowledge tests to obtain your CLP, depending on what class of license and what endorsements you need. The CLP learner's permit knowledge tests and endorsements include: Exam Time Allowed (Minutes) General Knowledge Air Brakes Hazmat Tank Passenger Doubles/Triples Combination Vehicles School Bus 60 25 30 20 20 20 20 20 No. of Questions on Exam 50 25 30 20 20 20 20 20 No. of Correct Answers needed to Pass 40 20 24 16 16 16 16 16 CLPs expire 180 days from the date of issue and can be renewed one time for an additional 180 days for no fee. If your learner's permit expires after the one renewal period and you want to get a new permit, you need to present the required sources of identification, take and pass the written tests, and pay the $30 written test fee plus the fee for any endorsements. 03/18