Well it's known by a lot of people that education is considered a very important thing in Asian cultures, so there has been the long-time stereotype that Asians are all geniuses at everything.
If anyone here lives in America or Canada, if you tried explaining to a high school student that had zero knowledge of a Japanese school curriculum, from the fact they go 6 out of 7 days (instead of 5) of the week and only have 1 full month for summer vacation (instead of 2), the student would probably get the easy impression of Asians being workaholics.
Heck I told my sister about it once and she didn't believe me their school year ended in March and started in April.