[somsak2]

>In school, you hand in your homework, get the feedback only after Christmas.

Is this supposed to be a problem? Research says that delays in getting corrections are not all that important, you still end up learning even if there's a fairly large gap. https://pcl.sitehost.iu.edu/rgoldsto/courses/dunloskyimprovi...

[akasakahakada]

Paper is more focused on "feedback benefit learning" instead of how long should people wait for feedback.

Seems that you are quoting another paper instead. But I don't think it is definitive, as you see, n=27. Also the experiment setting is not about how long after initial test, it is about how short before the next test.

https://link.springer.com/article/10.3758/MC.37.8.1077

> The participants were 27 students enrolled in Grade 6 at The School at Columbia University in New York City.