12208 Views 1 Reply Latest reply: Aug 3, 2010 12:39 PM by Ingo2711
Hard to say, it depends on your iphone model, the data to back up and the number of apps installed adding their part of data to the backup.
If you copy all the pictures from the camera roll before and delete the original files, it should be under one hour, close to 30min using a 3G. Also transfer your videos before you start.
See what else is part of the backup: http://support.apple.com/kb/HT1766