The factor time is an often neglected issue in the literature on network governance. In this article we analyze the differences in perceptions on time between actors involved in water governance and describe the managerial interventions aimed at synchronizing time horizons, managing the available amount of time and the tempo of the governance process. Two case studies of governance processes in the district of Water Board Delfland are included to provide insight in the question how the factor time influences the governance processes and how aspects of time are managed. The case studies show that different perceptions of time may cause tensions in collaborative relationships, and even cause the end of collaborations. This underscores the importance of time-sensitive governance.