It normally shows the length on the outer layers (both TOP and BOTTOM) and is a simple addition of the cline segs. You can use Show Element on Cline Segs (or Clines) and then hover and use the TAB key until you get either Cline or Cline Segs. The actual value of exposed length is shown if you hover over the DRC marker with a tooltip or if you look at the Actual cell in Constraint Manager - Net - Wiring worksheet. You can also look at a report Etch Length by Layer report, then look for the net in question.
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