In plain language, what does "Downswing duration" mean on my monitor or export?

Time from top of backswing to impact.

Units: seconds

Why does this metric matter for ball flight, dispersion, or scoring?

Works with tempo and hand-speed timing to describe how abruptly you move from transition to release.

What is a typical or competitive range for this stat?

Same as other timing metrics—trends on the same camera matter more than a single global ideal.

What usually makes this number look bad or noisy in real rounds?

Rushed downswings often correlate with face-control issues.

What other metrics should I look at together with this one?

Swing tempo (back : down), Backswing duration, Peak hand speed → impact time