My dad always asks me this and I usually end up saying that God and heaven are outside of time and that the soul is eternal, I just don't have any answer other than that.
How would you answer this question? because I have also heard this question from a few other people as well... again I don't believe in a waiting room, I imagine a timeless gathering of believers in heaven
An exercise I have found helpful is to imagine myself able to do anything I desired without any consequences whatsoever... That this is the condition of my soul after departure after this life... With no more resistance to sin at all... And then that I am passing through the realms of the demonic temptations where each one tempts me according to its powers - The Demon of Anger, the Demon of Self-Importance, the Demon of Superiority, the Demon of Resentment, the Demon of Lust, the Demon of Fornication, the Demon of Power, etc etc etc...
And in each of these temptations, I am no longer able to resist the temptation based on my ability, my power, to turn from it, but can only slip into it or not based on my previous repentance from it while on earth... And when I get to the one from which I did not establish repentance on earth, there I will enter and remain, stuck in my unreported sin(s)...
This is why the Church prays for the Departed... And this is why their sins are bound by the prayers of those who have been given the power to bind and to loose sins... And in this way, and through the ongoing prayers for the departed, we raise our loved ones through our love for them, as they begin their journey into eternity... And this is the preliminary Judgement, in which we abide, whether as Lazarus or as the Rich Man, until the Dread Judgement Day of the Last Judgement...
The literal Greek of Paul says:
"For me:
To live: Christ...
To die: Gain..."
Not so for the Rich Man...
Arsenios