Final answer:
Sliced roast beef can be refrigerated for 3-4 days at 41°F or below before it should be discarded.
Step-by-step explanation:
The maximum number of days that sliced roast beef can remain refrigerated at 41°F or below before it must be discarded is typically 3-4 days.
According to food safety guidelines, perishable foods should be discarded if kept at a temperature between 40°F and 140°F for more than 2 hours.
It's important to monitor the temperature of your refrigerator and ensure it stays at or below 40°F to inhibit bacterial growth and maintain food safety.