How long does my downloaded PACK data stay on my device within the app?

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