This is a really hard question to answer because it is quite subjective as everybody is different.
One of my colleagues did all 14 exams and study in 6 weeks (he took time off work) whereas I did mine over 12 months whilst working full-time. I didn’t have much of a life during that time: studying for a couple of hours each evening and then at the weekends- it was quite a stressful time but I put lots of effort into the study and I was the same at school/uni. There were others who did it over the same time period and put half the hours in and still passed.
It can be done in the time states but it’s dependant on the type of person you are as to how stressed you are willing to get/how much free time you have/want to have.