Long days are bad enough, but I've just got back from a week long wedding. The bride and groom hired a large house abroad for the week because they wanted chance to catch up with everyone properly.
Apart from the annoyance of having to use up my summer holiday staying somewhere I wouldn't choose, with people I mostly didn't know, the real killer was that when we got there we were put into 'teams' to help with the wedding preparation - moving furniture around, decorating the house and grounds, cooking and washing up. This was supposed to be fun, but it felt like a grind.
I don't cook, and because I couldn't contribute on this score I ended up in the kitchen washing up and clearing dirty dishes every evening - for a very large group of people.
I was also the only Brit there, and although everyone else was kind enough to speak English to me, they obviously spoke their own language to each other so I never felt I could join in with the little groups of laughing people who all seemed to know each other and were having a great time. I have never felt so lonely, despite normally being perfectly happy to meet and chat with new people. Plus I just can't do night after night of drinking and socialising any more, I just don't have the energy. By the time the actual marriage ceremony rolled around at the end of the week I was exhausted.
If I ever get invited to a multiple day wedding again, I'm declining.