I ran across this the other day, and thought it was interesting since I keep meaning to actually use my crockpot. . .
All crockpots or slow cookers are NOT created equal. The following is only a rule of thumb and your mileage may vary.
Conventional Cooking Time: 15 to 30 minutes
Crockpot Cooking Time: 1.5 hours on HIGH - 4 to 8 hours on LOW
Conventional Cooking Time: 30 to 40 minutes
Crockpot Cooking Time: 3 to 4 hours on HIGH - 6 to 10 hours on LOW
Conventional Cooking Time: 50 minutes to 3 hours
Crockpot Cooking Time: 4 to 6 hours on HIGH - 8 to 18 hours on LOW
Most stews, pot roasts and other uncooked meat/poultry and vegetable combinations will require at least 8 hours on LOW or 4 to 6 hours on HIGH.