If your teams are playing multiple games per day and you want to minimize the time between games, try this menu item under the Tools menu

The ability to close gaps between games is totally dependent upon how many venues and timeslots you have available for the schedule. For instance, here is the initial run of a schedule where one team has to wait around 5 hours between games.  After executing the menu item, the gap is significantly reduced

 Reducing time between games

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