How long does it take to annihilate a family?
There might be countless answers depending on the comparison of their strengths.
But one thing is certain, the greater the gap in family strength, the less time and preparation is needed.
If the world's families had to be categorically divided, there would generally be two types in the early stages.
The first generation established the family, was built by one or two ordinary warriors from the Fierce Realm who rallied their own relatives and passed down their own martial arts. If they were lucky enough to have descendants, the family could continue to multiply. Generally speaking, with the passage of time, they could become a small clan with a fixed range of power and industry.