On average an MOT test takes between 45 - 60 minutes. It's always best to allow an hour to be sure your car is ready when you go to collect it. Time may vary if repairs are required.Share this: Typically an MOT test will take between 45 and 60 minutes. Here at Halfords Autocentres we have convenient hourly slots for you to choose from.t's always best to allow an hour to be sure your car is ready when you go to collect it. Time may vary if repairs are required. Share this: Typically an MOT test will take between 45 and 60 minutes.