For our continuing education courses: No our exams are not timed. You can spend however much time you need on the exam. You also have a printable version of the exam that way you can use it to mark your answers as you are going through the material, then when you are finished you can simply enter in your answers online.
Note: None of the answers are saved when taking the online exam. Once you start you must complete it. You do have unlimited retakes.