If all the spaces are conditioned and they have a similar usage pattern (e.g. similar occupancy schedule, loads) and facing a similar direction (similar solar radiation) then you don’t need to model all of them. There will be minimum heat transfer between them.
Even if you want to model the adjacent rooms you can model the closest ones and model the rest as shade objects. It is unlikely that you need to model 600 rooms for comfort studies in two rooms.