Despite the film trying to seem like it's done in one continuous take, the time shown on various clocks doesn't move linearly. The first four times the digital clock on the wall is shown, the time is about 3:10 ahead of the film's run time (e.g., 00:05:40 compared to 0:02:28). After that, it extends to 6.5 minutes (e.g., 00:19:00 compared to 0:12:37)