Once, many years ago (seven? eight?), we went overnight to expand our video game department from one 20ft run to three 20ft runs. I was the Electronics Specialist at the time, so I was assigned to close that day in order to demerch the three runs--but when the outside contractors got there to do the installation of the new doors, shelves, display kiosks, etc., they were so absolutely clueless that I felt I had no choice but to stay and help them (our store was the first in the city to do this project, so the contractors were seeing all this stuff for the first time). The plano team was busy resetting all the OTHER aisles in Electronics so there would be places to go with all the merchandise that came out of the two runs we were losing, which meant that in addition to helping actually build the new display cases for the aisles, I had to set and stock all the planograms myself. It was a long shift. I ended up working something like 3pm to 9:30am.
In the sense that you meant the question, though... not counting the 3am-4am Black Wednesday closes, I think the latest I ever stayed was in the 2-2:30 range, back when we still had to get the store superzoned every night (and had the payroll to afford it).