In iOS 7, some apps can now update their data even when the app is not open. This feature is called "Background App Refresh". How often does each app update their content using this method? Is it up to the app to determine the frequency, or does iOS 7 limit them?
IOS – How often do Background App Refreshes occur in iOS 7
applicationsiosmultitaskingsoftware-update
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Best Answer
This depends on several factors and is not generally tied to a fixed time schedule - active usage of the device, push notifications to apps, location based updates and iOS 7's learning ability to optimize based on your usage patterns for apps.
From iOS: Understanding multitasking (bold italic emphasis mine):
To improve battery life, you could selectively turn off background refresh for certain apps from Settings > General > Background App Refresh.