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 m

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.