How many years is a cycle?

If there is reincarnation, then you should not kill a mosquito or trample an ant to death, because it may be your eighteenth ancestor.

I told a good joke: a monk talked about reincarnation and told people not to kill pigs, otherwise they would become pigs; Don't kill a dog, or you will become a dog in the afterlife. A man asked, monk, are you encouraging us to kill people? Because killing a pig becomes a pig and killing a dog becomes a dog. )