My project has reports that are due a specific number of days prior to and post an event. On the Gantt Chart I want to show in the "Duration" colum the number of days that the report is due, but my days keep changing on the task that has the test event. For example, I have a test event 2/7-2/14, I have a Test Readiness Review due 14 days prior to the start of the test and a Test Plan due 45 days prior to the start of the test. I would like to show the 14 days and 45 days, respectively, on the Gantt Chart, but when I make them Predecessors to the test event my dates change on the test task. Can I change the Calendar to count all days and not only business days?