Pardalis:
This Heaven and Hell thing, as I understand it, is in the presence of, or completely missing and the absence of, God. What is key to all this is that the physical body remains behind (unless you are Mary and Jesus, see Assumption and Resurrection/Ascension) and the spirit/soul arrives somewhere and somewhen. I have been advised more than once that God is unbound by time, and thus when we die, time as you and I experience it in the flesh is not applicable to the state of grace in Heaven. One simply is, and is thus free of the constraints of Time. That never made any sense to me until I read a set of fiction books by Robin Hobb, who is IIRC Catholic, or raised as one. Suddenly, what I'd been presented with previously clicked.
So, if you are not "with God" where/when are you? Well, somewhere/somewhen else. Presuming that sentience remains in this state, I suspect that the average atheist/skeptic (like the many I have met on this board) would find some way to amuse him/her self wherever and whenever that is. If it's in a lake of fire, without a physical body being there, studying the minute variations of the flame and lava would be a source of quite some interest, for example. And no distractions!

One could even argue with Larsen over the flames for a long time. Wait, might that be Larsen's Heaven, and your Hell?
The assumption of suffering at that level assumes that those not in the state of Heaven, with God, deep in their heart of hears wish to be "with God" when life is ended. But what if one didn't give a flying fart? Then the absence of God isn't suffering, is it?
Since God leaves the path to him as conditional on the choice to take it, then provision for the rest is "somewhere/when" else. That "other condition" is assumed to be bad. Heck, with God knowing how wonderful being with God is (if yer gonna create a Universe, you might have the ego to match, eh?) of course God encourages his children to follow that path.
We can use a bit of a parent analogy here, if you like. You love your children, but they may not follow the path in life you set out for them. You still love them, even if they stray.
If those going to that other state are already not suffering by not being "with God, " then there'd be little suffering in the bodiless stage to not be "with God." For those in Heaven/With God, that other state would be as a default inaccessible anyway, as being with God precludes "not being with God."
A possible Hell for the not with God state is an eternity of conscious boredom. However, if this board of skeptics is any indication, if even two of those spirits in that state run across each other in the otherwhere/otherwhen, or commune in any way, the Larsen jokes would start almost immediately, as would an attempt to reach down to Sylvia Brown and screw with her through the ether!
For all we know, "not with God" is a torment of too much beer and pizza for eternity, whilst watching the Lions play on every TV set equivalent in the non physical state.
DR