"fluently, deeply and completely" is certainly above B2 though - but I would assume the list includes one's native language(s). Sorry, haven't watched the video.vonPeterhof wrote: interviews with polyglots who can speak dozens of languages with varying degrees of proficiency (conducted by Erik V. Gunnemark and Dmitri L. Spivak) reveal that the number of languages they believe they know "fluently, deeply and completely" tends to be 7 ± 2.
I voted for 50-100. I've never aimed to speak that many languages myself - in fact I started most languages I want(ed) to learn before I was 20.
BTW I was shocked when I read the words "Professor Argüelles could speak quite a few" Seems like I haven't missed any bad news.