As an isolated counter point, in high school I went to a summer program (aka “nerd camp”) where we had Japanese drilled into us from 8am - 9am every day for 5 w

As an isolated counter point, in high school I went to a summer program (aka “nerd camp”) where we had Japanese drilled into us from 8am - 9am every day for 5 weeks by native Japanese speakers. I can still count to 10 today 20+ years later.