What is the longest layover that you have experienced While Traveling?

I've been at the airport for about 17 hours.

My layover got in last night at 8 PM and my 2nd flight was the last flight of the night and was cancelled. I've been on standby for 3 flights this morning and finally got on one that departs in a few hours. I was initially told that I couldn't get any flights today and I'd have to wait till Friday.

American Airlines policy also states that they will not reimburse you for food, hotel or transportations costs if it is caused by weather. They will only provide accomodations if it is "caused by them".

Anyways, misery loves company so please share your stories so I can cope for the next few hours