The time it takes is up to you!
Some people take a long time to study, others get through the material a bit faster. It all depends on your study habits.
You have the option to attend a bootcamp five (5) day course, and take the exam at the end, or you can continue to study until you feel ready. If you chose the self-study option, simply study for however many weeks or months you need to feel confident to challenge the exam.
Note: If you were issued an exam voucher when you took the course, please make sure you contact your Center about when that voucher's expiry date is.