Oh, and it usually happens over a period of two years. That is the average. It will continue until someone puts a stop to it, be it the mother or the child her/himself.
Only the most recent encounters are counted for punishment because of a statute of limitations for the older encounters. This makes it harder to prosecute because it reduces the number of incidents for that case. It could have gone on the child's entire life yet only the last few count if they are within a certain time span.
Now, add to that the two witness rule where the only witness is a child who would make a bad one because of age and you get pedophiles who get away with it.
Please know that only .05 of children lie about being abused.
Less than 2% of women lie about being raped.
Also, add to all of this that the men are upstanding in the congregation and you have pedophiles and rapists with diplomatic immunity. DI keeps the congregations LOOKING clean.