[leggomylibro]

Well, you do hear humanity likened to a cancer fairly often. Look at what we do to other species, and we're even trying to metastasize to other planets. Lucky for us that this universe doesn't go in for it's millennial checkups, huh?

[stcredzero]

If cosmic things had millennial checkups, they'd be cosmic-scale in their hypochondria. That would be like me getting a checkup every second.

[lioeters]

I wanted to find out the unit of time of "every billion years" - first thought was "billennial".

Apparently, a millenium is otherwise known as a kiloannum; a megaannum is a million years, and a gigaannum is a billion.

So, a reasonable universe should be getting gigaannual checkups.