PlanManStan writes:
When would they have had all their children?
The Bible has relatively little to say about women having children. In some cases it is explicitly stated that men had their children with more than one wife; it's probably implicit in many other cases too.
PlanManStan writes:
Do you think this has any bearing on the fact that many biblical woman lived hundreds of years?
It wouldn't be a problem for anybody who was determined to avoid it.