Go as Fast or as slow as you want. Naturally you'll want to get started fast. You can start immediately and finish as quickly as you wish. Or, take up to two years to complete. Every study unit has self-tests built in so that you never have to take an exam before you're ready.
All exams are open book.
No need to depend on memorizing a lot of material. Refer to your open book as much as you want while taking your exam. We want to know that you know how to find and use information. For those questions you might get wrong, your instructor will furnish the references you need to find the correct answer in your Study Units.