A Fairfax County experiment with extra-long school years will come to an end this spring, targeted by the district’s severe budget cuts.

Seven of the county’s elementary schools, all but one of them among the county’s poorest, operate on a “45-15” model, meaning 45 days, or nine weeks, in school, followed by 15 days off. The setup allows for several two-week “intercessions,” when the schools offer extra tutoring to struggling students and summer-school-like classes for the rest.