Calculate total length of railings on 2nd floor

Hi, i want to calculate the total length of railings in 2nd floor, but i cant do that can teach me how to do it?
thank you.

Hi @ZacY , will this work for you?

oh hi thanks for the help, but i do have a warning, is that because i have some parts are null?

Warning: Asked to convert non-convertible types

Yep, these are the railings hosted by stairs.

oh ok thank you very much

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