More than long enough, Initially fed it hidden down the Windscreen post, across half the windscreen down to the console beneath the vents and still had enough. Since the suction fixing is best on glass, I now have it on top of the dashboard, all cables hidden and the arial is small enough not to disturb any view at all. Works really well, either using local FM or an AUX cable.

More than long enough, I ran it initially hidden in the windscreen pillar, across half the windscreen down to the console under the air vents and still had enough.
As the suction mount is best on glass, I now have it on top of the dashboard, all cables hidden and the aerial is small enough not to interfere with the view at all.
Works great, via FM or via AUX