How do I find the length from the end of the surface to the end of the surface, if there are 2 or more elements

For geometry this simple I’d pull the vertexes, convert to points, and draw a line by best fit though the points. Then pull the direction and negate the Z value if it’s not ‘flat’. The length of the vector should be a pretty good indication of the length in question.

If it’s a single element then you likely have a parameter you can pull which will be more accurate still.

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Okay, thank you for the suggestion, I’ll try it