yeah i agree. i was just doing a site visit and saw two weddings while we were there, and it seemed to work just fine to have just a 4 hour reception. people had a lot of fun, but it's not like your typical wedding where people are seeing each other for the first time in ages -- they have already been spending tons of time together. i think a good way to think of it is that the whole week/weekend is sort of your wedding celebration, so the length of the reception itself is not such a big deal?