[Anthony]

Don't just use a sine wave, as they can heat up the voice coil quite a bit if left on for a long time. Use warble tones or pink noise, or just general music or movies to do a quick break-in.

That being said, I don't know how long, but I imagine a couple of solid hours of use or a couple of days of casual use should suffice to loosen the suspension and shake anything else into place.