The most I have worked on something is 14 hours. It was for a university project, that involved creating a "banking" app that was intended to demonstrate the use of an SQL database. I had a partner, and we had done nothing about the project until the previous day. We started working at 5 PM and the demonstration was at 12 PM (noon) in the next day. We used PostgreSQL for the database, and C# and Windows forms for the GUI. My partner took on the database creation and I took on the GUI. I had minimal experience with C# and had never worked with Windows forms or DB bridging in a program. On top of it, lack of sleep hits me really hard, so by midnight I was just like a zombie with near zero focus capacity. As a result, I ended up rewriting numerous components with identical logic and appearance and some different elements that could be parameterized, simply because organizing my thoughts to write proper code was out of the question in my condition. The writing, debugging, testing and packing of the project ended at 7 AM, the morning of demonstration. I slept for 3 hours and then met with my partner and headed to uni. I never left a project for the last moment again. We ended up taking a 9/10 grade.