ok ok how much bands you got?
and how long you prepaired
CLB7, B2+ in one from what I remember, others were C1. About the timeline, things you should know:
1. I was casually preparing for ~ 2 years, with a lot more focus on work, my own companies, etc. Was good at french, but was overlooking a few shortcomings when it came to the exam. Got 3 B2+ and one B2 2 or 3 times (which isn't CLB7)
2. Spent 5 months fixing my shortcomings and got CLB7 in the very first attempt.
I know people who have reached CLB7 in a year (Google Youtube and you'll find many of them).