Packed data will vary in the duration that it is kept in-app on your device.  Below is a chart that shows how often various data types are updated (when online) and how often they will remain on your device (when offline).  

Packed Item	Connected to the Internet	Offline
Fuel Prices	1 hour	1 month
Weather Markers (for map)	5 minutes (1 minute during reduced refresh period*)	7 hours
Winds Aloft Markers (for map)	10 minutes (2 minute during reduced refresh period*)	12 hours
Individual Station/Airport Weather Reports	3 minutes (1 minute during reduced refresh period*)	7 hours
Airport NOTAMs	10 minutes	4 days
TFRs	10 minutes	14 days

* Reduced refresh period - When connected to the internet, the app will search for new data more frequently when within 8 minutes before the top of the hour and 12 minutes thereafter until new data is retrieved.