November 2011 SCHOOL BUS DRIVER LICENSING PROCESS FACT SHEET TRAINING REQUIREMENTS: To initially obtain a school bus endorsement, the driver must complete a minimum of 20 hours of instruction, which includes 14 hours of classroom instruction and 6 hours of in-bus training. TO MAINTAIN CREDENTIALS: Every four years, a school bus driver must: Complete a minimum of 10 hours of refresher training, which includes 7 hours of classroom instruction and 3 hours of in-bus training.