I had a long one recently in which I did an APA and a Classic American Pilsner on the same day, two mashes, two boils. I don't really recall when I started but I finished sometime around 2AM and made a mistake in the wee hours. I wasn't paying attention to my boil on the 2nd batch, I guess, and I ended up with a lower volume and higher OG than intended. Correcting this would have required a trip to the well and boiling more water. It didn't seem worth it. So my Pils became imperialized, with an OG of 1.080.