Here are some statistics : Francisco Valdomiro Lorenz born spoke 189 languages. - Carlos Amaral, claims to speak 170 languages. - Ziad Fazah born June 10, 1954, claims to speak 58 languages. - Cardinal Giuseppe Mezzofanti (1774-1849), Italian ecclesiast, is reported to have spoken thirty-eight languages and fifty dialects fluently. - Emil Krebs German sinologist (1867-1930). Spoke 68 languages fluently, and understood more than 50 further languages. - Rafael Cardinal Merry del Val, was said to speak up to 63 languages and dialects. - Kenneth Hale (1934-2001), MIT linguistics professor (over 50 languages) - Rolf Theil Endresen, Norwegian linguistics professor (over 50 languages) - Georg Sauerwein(1831-1904), German linguist (over 50 languages) - The German Francis Sommer, who died in 1978, was said to be fluent in 94 languages. - Carlos do Amaral Freire has mastered more than a hundred languages, published translations from 60 languages, but is a fluent speaker of 90. He still studies one or two new languages every two years. - Hans Conon von der Gabelentz (1807-1874) reportedly was fluent in eighty languages. - Uku Masing (1909-1985), an Estonian linguist, theologian, ethnologist, and poet who was fluent in approximately 65 languages and translated from 20. - Istvan Dabi, Hungarian translator, translated from 103 languages - Sir William Jones (1746-1794), British philologist - reported to speak forty-one languages. - Robert Stiller - Polish, speaks about 60 languages - Harold Williams, New Zealand journalist and linguist, spoke over 58 languages. - Andrzej Gawroski (1885 - 1927) - Polish linguist, professor of Jagiellonian University and Lviv University, could speak and write in 40 languages, understood and could read in about 100. Source: http://worldsgreatestpolyglot.com/

The sky's the limit. It depends on your ability.

MAY BE 7 OR MORE...

Depends on people.

I have no idea about, but I think it is possible to improve the main language we need to learn.