I’m unsure how much testing is done on Cachy. I’m on Tumbleweed, which is a rolling release with a focus on stability.
There isn’t much point in waiting to apply updates because new builds roll in fairly frequently. It’s not always the same packages of course, but most rolling release distros are on the bleeding edge, it’s kind of the point.
I update a couple of times a month. Around every 7-14 days. You want to avoid letting it go for too long, because as changes accumulate the risks of more complicated conflicts and breakages arising increase.