If you're doing it ad-hoc you could go to a "Planning" > "View" tab and bring up the relevant display. Then change the display settings (daily/weekly, etc, as well as # buckets). Then export.
For something more global across the environment, you'd want to modify "Configurations" > "Manage Display Settings". You'll see an item called "Report Period", which is probably what you'd want to look at changing.. duration, offset, or otherwise.
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