IPhone 5.1.1 Update: Quick via iPhone. Way long via iTunes?

I started to download 5.1.1. via iTunes and the time estimated was over an hour and the file was 300MB (not sure, don't recall).  So, I stopped the download after ten minutes, and went right to the iPhone to download the update.  Both iTunes and iPhone connected via wifi.  The update using the iPhone took five minutes to download and the file was much smaller (50K?).  Why the difference in time?

The over the air update is incremental so only updates what needs updating, I saw a figure that on some iPhone's the update was about 46mb, the iTunes version I believe downloads the whole new 5.1.1 version of iOS so its much larger nearly 700mb for some iPhone's. Over the air updates work just fine.

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