Detecting Room Boundary in huge model

[jjhj9641TQSGP]

I'm working on a huge model so we separated a model in some zones.

But the problem is that we need Room Data Sheet, but we never created room boundary.

We need to know how to automatically draw room boundary (middle of wall).

I tried to integrate the each models in one (only Architectural objects), but it took hours.

Is there any other ways to optimize the process or some other cases? 

[ToanDN]

Why do you need room boundary lines when you already have walls?  Set walls to be room bounding.

[jjhj9641TQSGP]

What I mean by this is that setting walls to be room bounding itself takes way too much time and it needs to be from the center of each walls. 

[ToanDN]

You can set room area computation to wall centerline.  Big projects taking time is expected, as clients are expected to pay more. 

[barthbradley]

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@jjhj9641TQSGP wrote:

What I mean by this is that setting walls to be room bounding itself takes way too much time

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Huh? Way to much time? 

Start your stopwatch.

Go to Uncropped 3D Wireframe View, Set View Phase Filter to "None", do a Crossing Window Selection of everything in the View, press "Filter" on the Contextual Tab, deselect everything except "Walls", press "Okay" and then check the box next to "Room Bounding" in the Properties Pallet.  

Stop you stopwatch.  

How long did that take?  Too long?