Eternity.
To paraphrase Doc Brown: "The appropriate question is, When the heck are they?"
That would get back to the question: Would God have made an eternal, unforgiven sinner? Because that's what he would have been if he was made eternal before the sacrifice of Christ.
I know that the argument can be (and has been) advanced that eternity touches all aspects of time so someone can be "saved" before the actual physical sacrifice of Christ, but if that's so, then why was God so pissed at Adam and Eve? After all, he could have just kept them in the garden because they were "saved" anyways.
Very true, dear brother in Christ!