You are at B2 level, when you pass a B2 exam. You can find free reading and listening comprehension exams online. I passed one for Italian with 13k LingQ Known Words, 1.5M words read, and 470 hours listened (I had mainly studied on LingQ and, when not, I added the stats - details in the thread):
Obviously, it depends how you study and what languages you know, etc. But that was just my case study.