How long to reheat a 4lb rib roast?

It's impossible to give you a precise time to reheat a 4lb rib roast without knowing the following:

* Starting temperature: Is it chilled from the fridge, or closer to room temperature?

* Reheating method: Are you using an oven, slow cooker, or something else?

* Desired final temperature: Do you want it to be just warm, or piping hot?

Here's a general guideline:

* Oven: Preheat your oven to 325°F (165°C). A 4lb roast will likely take 1-1.5 hours to reheat to an internal temperature of 145°F (63°C).

* Slow cooker: Set on low and cook for 3-4 hours. This method will keep the roast moist and tender.

Important tips:

* Wrap tightly: Use foil or parchment paper to prevent drying out.

* Use a thermometer: The best way to know if the roast is heated through is with a meat thermometer. Insert it into the thickest part of the roast.

* Rest: Once heated, allow the roast to rest for 10-15 minutes before carving.

For a more accurate estimate, provide me with the details mentioned above.