Do I have enough time to perform a Server update when my App is started from Background mode?

Do I have enough time to perform a Server update when my App is started
from Background mode?

References

Reference NO 1

http://stackoverflow.com/questions/15198795/do-i-have-enough-time-to-perform-a-server-update-when-my-app-is-started-from-bac

Reference NO 2

http://www.raywenderlich.com/29948/backgrounding-for-ios

Reference NO 3

http://www.mindsizzlers.com/2011/07/ios-background-location/

Reference NO 4

http://kentnguyen.com/ios/what-does-it-take-to-make-an-ios-app/

Reference NO 5

https://www.zombiesrungame.com/support/

Reference NO 6

http://developer.apple.com/library/ios/documentation/iphone/conceptual/iphoneosprogrammingguide/ManagingYourApplicationsFlow/ManagingYourApplicationsFlow.html

Reference NO 7

http://msdn.microsoft.com/en-us/library/ee787088.aspx

Reference NO 8

http://www.d2pad.info/index.php?option=com_content&view=article&id=180&Itemid=204