[Dyerryjex]

Real Time Zone is the area in the astral that is most like the physical. You can say that it's a more subtle version of the physical, or an energetic copy of the physical.
This roughly corresponds with what some call the etheric. However some consider the etheric to be the most 'like reality' in between the RTZ and the physical.
Robert (and I also) considers this part of the astral. However, the 'astral proper' would be any zone or area or consciousness focus that is higher than the RTZ. This can go from the 'lower astral' all the way to the higher astral. Then on to the buddhic, mental, etc. which are technically above the 'astral proper'.
For example, I routinely have OBEs with separation to the RTZ and then usually go to the astral via vortex, portal, or fly up and phase shift into the astral.
So you see it is really a matter of perception and what system of classification works for you best and describes your experience best.
To me, it's all the astral, even when I'm sitting here in my back room playing with the computer. But my head has always been in the astral, to the consternation of my family members and friends.