Longer school days + better #resources = real gains.
Jorge Agüero, @martafavara.bsky.social, Catherine Porter & @alansanchezj.bsky.social found a Peruvian reform boosted #math scores by 0.19 SD & reading by 0.10 SD. Instructional time matters, but so do complementary inputs.
doi.org/10.3368/jhr....
