My son and I had a conversation about how you tame and about how the behavioral extinction process is the same for taming animals to ride them as it is to get bullies to stop. They will fight you and eventually stop – if you do not give them their reward.
How long does it take? Well, are you dealing with someone who is in control of their behavior or not? If they are, a few days to a few weeks tops. If they aren’t, it can take longer.