How long does it take to domesticate animals?

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How long does it take for a trainer to domesticate a giant cave spider and a hydra? I have them both restrained with a chain over an animal training zone.
I frequently see the animal trainer having no job
even though he has two animals to train. They've been stuck in a Trained
state for a long while now. Do they have to be released from the chain to be trained further also?
Another odd point is that the wiki says hydras are "Not trainable", but my hydra is marked as Trained
, which adds to the confusion.
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How long did it take to domesticate animals?
Most of the domestic animals familiar to us today were domesticated not long after people began farming and living in permanent settlements, between 8000 and 2500 BC. Domestic dogs are descended from wolves (Canis lupus).How long is the domestication process?
Domestication is a 10,000-year-old process in which people found new ways to control different plants and animals to better suit human needs. Archaeologists and scientists are using genetic testing to continue to study how ancient people did this.How long would it take to domesticate a fox?
It took only about 35 years to completely domesticate the species. It took only about 35 years to completely domesticate the species. Perhaps most surprising of all, the Institute of Cytology and Genetics in Novosibirsk, Russia, is still breeding and improving the animal.What does it take to domesticate an animal?
Domestication happens through selective breeding. Individuals that exhibit desirable traits are selected to be bred, and these desirable traits are then passed along to future generations. Wolves were the first animal to be domesticated, sometime between 33,000 and 11,000 years ago.Animal Domestication - Why Some Animals Can't Be Domesticated
Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.
Images: Jan Kopřiva, Julia Volk, Sienna Paxie, SP CENA