The half-hour slot has to serve more than the infomercial
A late-night infomercial is typically bought as a block of airtime, but the station still has to fit its own obligations and local programming into the schedule. Ending the paid program at 28 minutes and 30 seconds leaves a 90-second cushion inside the half-hour block.
That gap gives the station room for its required identification—the brief announcement of which station is broadcasting—and for local commercials. Those breaks are controlled by the station, not by the company whose product the infomercial promotes.
Why the extra minute and a half matters
Television schedules are built around fixed time slots. If an infomercial used every second of its half-hour, the station would have no clean space for those station-controlled elements before the next program or scheduled block began. The shortfall could ripple into the rest of the schedule.
The 28½-minute runtime is therefore a practical fit: the infomercial occupies most of the purchased slot, while the remaining time lets the station complete the broadcast and sell local ad time. What looks like an oddly precise program length is really a boundary between the advertiser’s airtime and the station’s.
