I think the same also. They put this as a high time period because they have no much staff to review all articles.
I always think HubPages is becoming a too much large network, even if it is maintaned by a group of 20 staff members (it is around this number): they need to hire more people, to enlarge the company, otherwise these limits will always be present. When Facebook was a little university's social network, 20 people to maintain it were enough, today Facebook would not exist if only 20 people maintain it. The same about HubPages: they will need to hire additional people in the future, otherwise limits will never change and also moderation of this website will be much harder.