This linguistic confusion is why Americans call the Pennsylvania Dutch Dutch even though they're Germans. To review: this country is the Netherlands, its people are Dutch, they speak Dutch. There is no country called Holland, but there are provinces of North and South Holland.
In clean, uncrowded conditions in tanks or ponds, goldfish grow fast. They can grow to a few inches (1 to 4 inches) within the first year. It really depends on their genetics and living situation. It may take a year or two before they change color from brown to gold or whatever color their parents were.
Rating Newest Oldest. Best Answer: goldfish eggs should hatch within four to five days. depending on the temperature of your tank. try this website http://www.flippersandfins.net/index.htm it gives you loads of info about goldfish and it will boost your knowledge best of luck with your goldfish eggs!