Russian in a PITA (Plug in the Answer) because of the vowels being dependent on the stress
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Not in my experience - I used to be fluent in Russian 50 years ago. Some words (not common) have over 50 letters, one or two have over 100, depending on grammar form (adverb, noun, verb etc), gender, declension, motion, etc. Many vowels are silent, elided, or not pronounced at all. Polish is baby Russian.
You say that in Warsaw, and you'll get your ass kicked, LOL!