Singapore’s teachers are working some of the longest hours in the world and are shouldering higher levels of work-related stress than their peers in other developed nations, a major international study has found.The OECD Teaching and Learning International Survey (TALIS), conducted every five years, is the world’s largest comparative survey of teachers and school leaders.Last year, TALIS canvassed 55 education systems, including 3,500 lower secondary teachers across all 145 public secondary...