This illustration shows a timeline with the following equally spaced intervals from left to right: 12:00 a.m., 6:00 a.m., 12:00 p.m., 6:00 p.m., and 12:00 a.m. There is an X on the timeline at the first 12:00 a.m. marker labeled "Scheduled Rum-Time". This X represents a scheduled job with a single-action schedule. There is a rectangle with dashed lines; the length of the rectangle starts at the first 12:00 p.m. marker and ends at the 6:00 a.m. marker. This rectangle represents the period of time known as the execution threshold; if this job does does not successfully run by 6:00 a.m., it will be discarded.