A part-time work arrangement may seem packed with perks, but there are some unforeseen downsides. For starters, many employees find it hard to disengage even after they’ve punched out—either out of guilt or plain old conscientiousness. “This is especially true for women, who often overcompensate for a flex schedule by working on their days off,” says Jay Mulki, Ph.D., an associate professor of marketing at the D’Amore-McKim School of Business at Northeastern University.