The GSI Helmholtzzentrum für Schwerionenforschung GmbH at Darmstadt, Germany, operates three accelerators, the main linac UNILAC (UNIversal Linear ACcelerator), the heavy ion synchrotron SIS18 and the experimental storage ring ESR. The ‘Facility for Anti-Proton and Ion Research’ (FAIR) which is presently under construction, extends and supersedes the existing GSI. Major service and upgrade measures of the GSI accelerator facilities were started in 2016 and will be continued until mid-2018. They are in conflict with large civil construction projects in preparation of FAIR and with refurbishment projects for the technical infrastructure of existing buildings. Furthermore, during the shutdown, several new projects were started, while others had to be canceled. The planning tools and communication structures have been adapted with the experience of the 2013 shutdown, to monitor actual progress, and adjust the schedule when necessary. In this presentation, we will show how this enabled us to react to unexpected incidents and to deal with the additional challenges of long-term projects.