0-15 minutes depending on the desired texture.
With carrots & most veggies you should bring to a boil then simmer only until tender to preserve nutrients & flavor. For carrots this takes about 10 minutes.
Carrots should be blanched for 2-3 minutes for optimal results.
you should boil them separately as to not mix flavors
When I'm cooking parsnips i always par-boil them befor roasting,15 minutes on the boil and then into the oven with knob of butter for half hour remembering to baste them half way through .
You should boil 2 cups of water for about 4-5 minutes.
Don't that's evil
30 minutes.
You can, or you can drain them. As long as they are properly stored in a sealed container, they should be fine.
Boil 4 cups of water for about 5-7 minutes.
If you boil it, the water will evaporate. If you leave it boiling long enough, you should only have salt left.
Carrots are better if they are cooked before being frozen. Cut them, boil them until they are tender, allow to cool and freeze them.
Boil water for at least one minute to effectively kill germs.