While not Europe, I can tell you my experience in Israel as someone who lived there in the 2000's, left in the 2010s, and returned in the 2020s(felt like a time machine).. within about 10-15 years so much of what I think was distinct about israeli culture seemed to vanish and it felt like American culture made a huge impact short of some older russian enclave communities(not including their children). Everything from television/music/movies/media, to slang and dating, politics and views, and just how people behaved in general (grew up in southern tel aviv surrounded by 'arsim' like a type of chav or something). There is still relics of it in behavior and style but it is almost always something I notice in people 40+ years.

I also saw it happen over the course of maybe 4-5 years when I lived in Mexico City in 2013-2017.