Putting in X years is sort of like the military. You put in your time, and then you can retire. In this case, it means that mothers have an obligation to devote themselves to raising the child for 18 years.
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seroMackBy the way, what does 18 years refer to? Mother's children?The author probably means that mothers would raise their sons until their offspring had reached the age of 18, and that was that – then motherhood would be over because their boys had become men who provided for themselves. It was quite normal that boys (or young men) l