I would guess about 400 hours based on my experience with the Philips SACD 1000. Be patient :)
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I'd agree to give it a few hundred hours. Probably best to use CDs, SACDs and DVDs too. Out of the box mine sounded really thin, lifeless with little bass. After about 200 hours I modded it with the Black Gate cap and was instantly much happier. Had more warmth, rhythmic drive and much better bass. It's still improving a few weeks later.
Play with the upsampling settings too. I like the 96K setting, but will re-evaluate after more burn in.