4-day-school test scores troubling

This is the 2nd in a 5-part series about 4-day schools in Idaho by Kevin Richert/Idaho Education News:

Advocates have no problem extolling the advantages of a four-day school week. It saves districts a little money. It improves student attendance. It helps schools attract and keep teachers. It fosters teacher training and collaboration. But when it comes to student performance, these same supporters choose their words cautiously. They’ll say the switch hasn’t hurt student achievement. It’s a tepid claim. The statistics call it into question. More here.

Thoughts?