¿How to determine the plaster edges in a project?

Hello everyone, I hope you’re all well. I’m new to Dynamo, and I was wondering if you could help me. I’m still a student, and I’m preparing a budget. They’re asking for an item for plastering edges, which would be the linear meters of the wall edges. But I can’t create it. If anyone knows how to do it, could you please help me?
Thank you very much in advance.

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