The longest flight delay I have ever experienced* is 11 hours — waiting for a charter jet to take me from Glasgow to Malaga for a package holiday on Spain’s Costa del Sol.
The reason given was urgent repairs to the plane — which, to be honest, is fairly compelling and mitigates the boredom of being stuck at Glasgow airport for half a day. I’m not so sure how I would’ve reacted if the reason was that they forgot to load the toilet paper.