Taking into account all contingencies, and applying a broad range of scientific theories plus adding known facts I would say when it is finished.
Long after everything on it is dead.
4,573,969,522 years: I am more optimistic than digitalia.
As long as it's here and spinning around, I think.
as long as the doomsday.. :P
depends on what you mean by "our"? how long can we exist on this planet? Lots of variables, including our abilities to adapt/evolve. We could destroy our habitat with nuclear fall out at any moment. I think the dooms day clock is pretty close to doomsday on that point. We could be struck by a meteor, we could have volcanic eruptions or be over radiated by a solar wind. But that's for our demise. As for the earth's existence, it will we around for how ever long it takes to become destroyed by a universal event. I get such a tickle out of those who say we are destroying the earth.. No we are destroying man's existence on earth.. but perhaps that's what is supposed to happen so that we might be the next fuel source for the next inhabitants?
And contrary to popular belief. Something I exactly believe is what we are perhaps supposed to be doing in the larger scheme of things, so as to lay a foundation for the next go round of life here.
Until the zombie apocalypse ends.
still i live
you exist you know
12 hours 6 minutes unless the timer malfunctions!