When are the Nightly Builds Released?

I’ve been wondering, a couple friends of mine and I seem to always be a version apart, I’ve got a vague idea but I’d like to know for certain.

There’s no schedule, there’s a server (http://ci.narc.ro/) that automatically pulls any new code that gets merged and makes a new build.
I usually pull stuff some time between 6 and 10 PM CST, some other devs that do merges pull things later in the evening (from my point of view). It’s really kind of random.

Yeah, the main builds on the front page automatically update the builds within the space of a few minutes from any of the devs merging.