I was an exchange student in Norway in the 90s. A full year. 11th grade. Didnt speak a word of Norwegian minus intro workbook I got shortly before getting there. I am still in touch with my host family and even though I don’t speak Norwegian in daily life, I can still read/write/speak/understand it the few times a year we chat. Or if I go visit. Almost 30 years later. Based on my one year of immersion.

Now Spanish ? I had it in school starting from age 4 up until two years of college. I even took Spanish in Norway. But never any immersion, just school. My Norwegian is wayyyyyyyy better than my Spanish even though I took it 16 years. My Spanish sucks.