What was the longest period of time you have spent with active coding so far?

For me, it was around 13 hours. It wasn't because of job, or deadline or anything, I just simply spent pretty much the whole day with coding. One day I woke up around 6 am, started coding at 7 am, and I didn't stop until 8 pm. I just felt like doing it, I had so many ideas I wanted to accomplish, and I had nothing else to do the whole day, so I had no reason to stop. Of course I took a few breaks, for example to eat, but they weren't longer than 15 minutes. I have done this a few times actually.

And actually I didn't feel bored or tired of it at all, I enjoyed doing it.

How about you?