You generally cook corned beef low and slow: about 3–4 hours on the stove or in the oven for an average brisket, or 8–10 hours on low in a slow cooker, until it’s fork‑tender.

Quick Scoop

Rule of thumb: plan roughly 45–60 minutes per pound, but always trust tenderness over the clock.

Typical cook times by method

  • Stovetop simmer: About 3–3½ hours for a standard 3–4 lb brisket at a gentle simmer until tender.
  • Oven braise: Around 3½–4 hours at about 325–350°F (160–175°C), covered, for a similar size piece.
  • Slow cooker (crockpot): 8–10 hours on LOW, or about 4–5 hours on HIGH for ~5 lb, but low gives better tenderness.
  • General weight guide (baked or simmered): About 50–60 minutes per pound at a gentle simmer or low oven temperature.

A simple doneness check: the meat should be fork‑tender (a fork slides in easily) and often around 190–200°F internal for really soft slices.

Mini how‑to example (stovetop)

  1. Put the corned beef (with its spice packet) in a large pot and cover with water or broth.
  1. Bring to a boil, then lower to a gentle simmer, cover, and cook about 3 hours, checking occasionally and topping up liquid if needed.
  1. In the last 30–40 minutes, add potatoes, carrots, and cabbage so they cook but don’t turn to mush.
  1. Rest the meat 10 minutes, then slice against the grain for tenderness.

Think of corned beef like brisket in “holiday clothes”: if it still feels tough, keep cooking—another 20–30 minutes can make a big difference in how tender it feels.

TL;DR: For “how long do you cook corned beef,” expect about 3–4 hours on the stove or in the oven or 8–10 hours on low in a slow cooker, and don’t stop until it’s fork‑tender.

Information gathered from public forums or data available on the internet and portrayed here.