Peacefield nailed it with stating that getting to know the couple happens BEFORE the wedding day. I might be a bit rare in this regard, but my average client meeting over coffee is 2-3 hours. We just talk about them, how they met, how he proposed, they usually ask us some questions about traveling (since we do a lot of it)... then when we've gotten to know each other, that's when I bring up, "so do you guys have any questions for me?"
I know that this comes down to individual personality -- and that everyone isn't inclined to carry on 3 hour conversations with strangers -- but I think we can all try to make our client meetings more personal (unless you already do something similar).
This is also why a regularly posted on, personal blog is so beneficial. My clients tend to feel like they know me before we even meet for the first time. Whenever they say this, I usually add that they do. I'm pretty transparent on my blog -- and it's a pretty good representation of who I am. Just another great benefit to blogging personal things and blogging on a regular basis.
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Now, 2008 and 2009 I only offered all day coverage. And that was real all day. My average wedding was 14 hours. Many of which were longer. I had the idea that weddings aren't timelines -- so I wanted to be available the moment people wanted to start remembering their wedding day to the moment people were okay with no longer having memories made with photos. It's not that difficult. I never asked for timelines other than "what time does the wedding start" and figuring out how much time we'd have for portraits. Asking for a 14 hour timeline just creates more work for your client -- and I've always been very big on being the wedding vendor that was the easiest to deal with.
You'll likely havea a lot of down time in the morning and TONS of down time as the reception dies out. That was always the killer for me. The last hour when almost nothing is happening 
Bobby