How to convert a regular recipe for the slow cooker
As a general rule, 1 hour of simmering on the cooktop of oven equates to approximately 5-6 hours on low or 2-2.5 hours on high in a slow cooker.
As there is little evaporation when cooking with a slow cooker, you need to reduce the amount of liquid. As a general rule, reduce the liquid (such as stock, wine or water) by about half of the original amount. A maximum of two cups of liquid will generally be enough for most slow cooker recipes (except soups).