You should know that the large number of wins required for Domination was intentional. They wanted to try the concept of some nodes that took a lot longer to capture (sometimes the majority of the war) but with a higher reward for capturing it. 5 Days is an ideal length in my opinion. It needs to always include a weekend though. Not all points had that high of a value and that high of a CP award.
You should note that saying "it takes 60" wins only applies to your situation. For mine, it was 200 wins to capture domination. The amount of wins depends on the size of the clans in your group of 8.
In my opinion, 5 days is about the perfect length.