SANTA FE, N.M. (AP) — New Mexico is threatening to cut off funding at public schools that try to switch to a four-day week as the practice has spread to more than four in 10 school districts across the state.

State lawmakers this month placed a moratorium on additional four-day school scheduling within a general fund spending bill that has yet to be signed by the governor.

Education officials and legislators say it's not clear that student academics and working families are helped by fewer, longer school days, even as teachers and administrators embrace compressed schedules.

School administrat...