[NicknamedBob]

"How much time, I have no real idea. But I'd guess some time prior to when the nearest star (that would be Sol, the sun as it were) greatly expands at the last dying stages of it's existence. Or so a theory concerning such matters goes..."

That would take about five billion years. The Sun is a main-sequence star, and that's the calculation. We won't even exist as a species by then.

We might be something else, but that's a different discussion.

There's a joke about an astronomer giving a lecture, and he tells his audience the timeline that I just related.

A man in the audience stands up and shouts, "What! How many years?"

"The sun will destroy the inner planets in five billion years," the lecturer restates patiently.

"Oh, what a relief!" The man sits down again, "I thought you said five million years."

[7MMmag]

Could be sooner! (why I’m laughing right about now, I don’t know...)