Yet both Shepherd and Illingworth are aware that getting all their work done in four days, rather than five, can come with a cost. Illingworth’s mandated office hours are now longer by 90 minutes each day from Monday to Thursday. “I work from 8 a.m. to 5 p.m., with a 30-minute break in the middle,” he explains. “We’ve had to cut our lunch hour in half. But I feel fresher, more focused and productive working for four days solidly.”