Direct answer
Perishable TCS food should generally be refrigerated, reheated under proper procedures, or discarded before it has been in the danger zone for 2 hours. If the surrounding temperature is above 90°F, use 1 hour as the practical limit.
If the food has exceeded the limit, or if nobody knows how long it was out, the safest answer is to discard it.
How to apply the rule
The rule is not about whether food still looks normal. Many unsafe foods look and smell fine. The question is whether time and temperature control stayed within safe limits.
For exam questions, identify whether the food is TCS, estimate total time in the danger zone, then choose the action that controls risk.
- Room-temperature picnic food: use the 2-hour limit.
- Outdoor food above 90°F: use the 1-hour limit.
- Food left out overnight: discard if it is TCS food.
- Unknown time: treat the history as unsafe.
- Reheating does not erase unsafe time in the danger zone.
Common examples
Potato salad, pasta salad, cooked chicken, burgers, hot dogs, deviled eggs, cooked rice, cooked pasta, cut melon, and dairy-based dishes are common left-out food examples because learners see them at parties and in exam scenarios.