Students spend 20 to 50 percent of their time online. The Bay Area's Rocketship Education is a high-performing elementary network where students spend two hours per day in a computer lab. KIPP Empower in Los Angeles has classroom centers that students rotate through.
Last week I visited Arizona's largest school, Primavera Online. Headquartered in Chandler, Primavera serves primarily upper division students seeking an alternative pathway to graduation.