It takes about 150 hours of burn in on the CC.
The CC takes a few more ticks on the volume dial to equalize with the CO. On the Bliss the CO I take to maybe -17 on some tracks, and on the CC I will be at -15.
On the CC or the AC, you're not going to get same expansive soundstage as their open counterparts, but it's still an excellent soundstage for a closed back. For me both the CC and AC sound very open, the sound is never in my head, and I forget that I have closed backs on after a few seconds.
While the soundstage has a predefined bubble of sound, for me it goes beyond my shoulders and sounds like sitting at my desk listening to a good set of desktop speakers about 3 feet away from me. It's just as holographic as the CO with excellent layering and separation of instruments and vocals within the soundstage, and for me that is more important than the width of the stage presentation.
In one aspect for me I like the soundstage of the CC and AC more than the CO or AO. With any open back I have to cut out any visual distractions to get full expansiveness of the soundstage and on the CC and AC I don't have to do that.