a billion years later

1. An approximated date when all multicellular life forms will die out.

2. An exaggerated statement for how long something may take.

“Hurry up! Is my food ready, a billion years later?”

“A billion years later, we’re all gonna die! Better start making the most of it...”

“Apparently, according to scientific belief, sentient life expires from this solar system supermarket at least a billion years later, and is also when I expect to get my ice cream cone by; assuming my friends can’t be slower than they are, already!”