Time as a food safety control is used to hold a time/temperature control for safety...

The FDA Food Code allows for "Time as a Public Health Control" (TPHC), where TCS food can be held without temperature control for a limited window. For food starting at $135^{\circ}F$ ($57^{\circ}C$) or higher, the maximum allowable time is4 hours. The food must be clearly marked with the time it was removed from temperature control and the time it must be discarded. In this scenario, the food was removed at 4 p.m., making the "discard time" 8 p.m. Once that 4-hour limit is reached, any remaining foodmust be thrown out.

The logic behind this rule is that after 4 hours in the "Temperature Danger Zone," bacteria may have multiplied to levels that can cause illness, or they may have produced heat-stable toxins that cannot be destroyed by reheating. Therefore, increasing the heat (Option C) or serving it "immediately" after the deadline (Option B) is unsafe. Additionally, the food cannot be returned to the refrigerator or freezer (Option D); once it is designated for TPHC, it is on a "one-way trip" to either being consumed or discarded. For cold food, the limit can sometimes be extended to 6 hours if the food temperature never exceeds $70^{\circ}F$ ($21^{\circ}C$), but for standard hot-to-room-temperature service, the 4-hour limit is absolute. Managers must ensure that staff strictly monitor these labels and never attempt to "extend" the time by changing the sticker.