There’s literally no reason whatsoever to install Clutter.
This is a system setting that is controlled by the configuration system of the environment, and toolkits should read that information for their internal event handling.
The question is: what are you trying to achieve by knowing the double click time?
I received a patch for Desktop Icons NG that implemented the double click detection without taking into account the displacement between clicks, because, as the author explained, the default double click manager doesn’t work fine for touch screens…
It was a patch similar to another already sent for the original desktop icons.