In this case, we have an existing study. Some countries habitually have a three month gap, with schools closing at the end of spring and opening at the beginni

In this case, we have an existing study. Some countries habitually have a three month gap, with schools closing at the end of spring and opening at the beginning of autumn. Overall, a three month gap in schooling results in sliding back by one month's worth of learning. So, missing three months of school results in being four months behind where students should be. Source: http://www.ldonline.org/article/8057/ http://www.ldonline.org/article/8057/