How early is "too early" for a morning wedding?

Based on the weddings I've featured here on Offbeat Bride, I'm going to go for "dawn" as my answer.

Many readers may remember a sunrise wedding we featureed. This wedding was remarkable for a lot of reasons, but it's worth noting is that an 8:30am wedding allowed the couple to have essentially an open guestlist, thanks to know that only the most dedicated family would make it that early, combined with the fact that they weren't feeding everyone a sit-down dinner.