We must be doing different brands...the 'required' time is 30 minutes for the ones I'm doing.
I don't actually read the questions when I'm entering them, I keep my fingers on the page, and enter answers by simply going down my written notes one after the other. I can quickly check to make sure all is good on the summary page.
The pictures load more quickly if you size them to VGA or the smallest resolution you have on your camera.
It really doesn't take me very long to take the pictures of violations...I just snap as I walk. After you do several hundred of them, you become very streamlined in your approach.
I have had entering them take as long as 20 minutes during prime time, but I have never, ever had an actual audit take longer than 30 minutes.