What is the max amount of languages one can mantain?

Im thinking of the journalist that speaks fluently 6 languages

My question is would it be doable:

Spanish italian french portuguese German dutch english Chinese

As c2 for all levels with a lot of years of training and studying AND MOST IMPORTANT..MAINTAIN THEM?

https://www.google.com/url?sa=t&source=web&rct=j&opi=89978449&url=https://www.independent.co.uk/tv/news/philip-crowther-journalist-russia-ukraine-b2020878.html&ved=2ahUKEwiltpHHg-SJAxUsTKQEHUAzEvwQFnoECCsQAQ&usg=AOvVaw3ILxU-l0akmCnR4pCtGvg5

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