Billeniums 

too long of a time to even be described; TOO DAMN LONG; billeniums

I haven's hung out with my buddy in billeniums

Billeniums by Marilu-Butters January 3, 2011

billeniums 

too long a time to describe with numbers

I haven't hung out with my friend in billeniums!

billeniums by Marilulu-Butters January 3, 2011

billennium 

A billennium is an event celebrated every billionth second from the time since 00:00:00, 1 January 1971. Unix enthusiasts have a history of holding at time_t parties, to celebrate significant values of the Unix time number.

At 01:46:40 UTC on 9 September 2001, the Unix billennium (Unix time number 1,000,000,000) was celebrated.

billennium by Pachanka November 1, 2012