It mostly depends on how large (or rather how thick) the chunk is. If you're talking about wafer-thin slices of salmon, then it'll defrost in about 30 seconds i

It mostly depends on how large (or rather how thick) the chunk is. If you're talking about wafer-thin slices of salmon, then it'll defrost in about 30 seconds in cold water, even if it was frozen at -20C. If you're talking about a whole large turkey, then it'll probably take more than a day.