Following the results of the Programme for International Student Assessment for Germany, the Federal Ministry of Education and Research founded the capital investment program "Future Education and Care" as a federal measure to support the expansion of all-day schooling in Germany. During this process it became obvious that learning and teaching in all-day schools had to take place within new time structures. In this context, the Land of Bremen initiated a new teaching time model, which is, so far, unique in Germany. The results of empirical longitudinal accompanying research on the presence teaching time model indicate that pupils from low socio-economic backgrounds profited most from the new model. Further, teachers' workload decreased and there was an increase in their cooperative behaviour. (Contains 2 tables and 2 figures.)