The Time to reach ejection temperature, cold runner result is generated from a Cool analysis, and shows the amount of time taken for all elements, including the cold runner, to freeze to ejection temperature.
At the start of the analysis (time zero), all elements, including the cold runner, are assumed to be filled with material at the melt temperature.
Ideally, the part should freeze uniformly and as quickly as possible. Look at the time difference between most of the model freezing and the last element freezing in the cold runner. If this difference is large, consider re-designing the part, or increasing the cooling around the last area to freeze.
Most parts may be ejected with the runners 50% frozen and thick parts 80% frozen.
Thick plastic elements will normally take the longest to cool.