Why? I can't think of any reason why a map shouldn't be replaced when a side wins.
It seems to me that you are saying you don't want people to win a map so easily.That sounds like a map design issue combined with country side dominance. I don't think I'd want to be on a map where one side was continually winning the same map over and over just so we could play the map longer.
they can't win the same map over and over, the maps are in a numbered rotation.
The OP proposed that a minimum time be set, so YES, a country could win the same map over and over if that happened.