It took forever for even small Patches for me, ever since they changed how the Update System works. No reactions on German Forums, so another plea to fix this here.
It's always during the copying process, the one that even works when you turn internet off (tested it), so no connection issue.

Hells, a Patch for Dissidia NT that was more than five times the size of recent patches was done within a blink of the time FF XIV needs for the small Hotfix Patches.