I agree with Hathor about creating an ager, but I also look at fourteen days and breaks between having kittens a bit differently. I actually adore this time because I love interacting with my kittens. I cuddle them daily to speed things up and I enjoy it immensely. The space of time between kittens I'm very excited with anticipation. It is like waiting for a holiday for me or a wonderful present to arrive. I just love that feeling and wouldn't want to rush the natural timing of things.
We don't speed up nature in real life so why should we be in such a hurry to do it here? For me at least it would remove a large part that is rather special in my opinion.