How long to cook depends on the size of cold water or hot water and chestnuts:

1. Chestnuts are cooked in a common pot with high fire for about 15 minutes, and then with low fire for about 30 minutes.

2. Cooking chestnuts in pressure cooker will take shorter time, about 10- 15 minutes.

3. Boiling chestnuts usually takes 5 minutes less in hot water than in cold water.

4. Big chestnuts are cooked for 5 minutes longer than small chestnuts.