So instead of breaking in to my opinion it is more a question of settling in, apparantly the new caps need some time to get properly adjusted to the circuit they are in.
It is the brain that settles in. If you claim the capacitor's properties are changing enough to be audible, that is about 1 dB. Maybe 0.25 dB under certain circumstances. This is easily measurable on a distortion analyzer. No manufacturer of capacitors claims break-in is real. No physicist claims it is real. Only audiophiles. What does that say? It is self-delusion.
But there is something else. If breaking in is an existing phenomenon the time it takes should play a crucial role in the ability of the person listening to determine noticeable differences. From what I have read so far on the topic and also to my own experience the human brain is quite capable of adusting to new situations, also to differences in sound. If changes in sound we are used to are taking place gradually, the brain adapts to it and I think these changes will just not be noticed. That is why personally I have a hard time in believing that breaking in is something that can actually be noticed, except for when the changes are very fast or very large.
The brain rapidly adapts, not the capacitor. That's the issue. If it were a real property it would have been measured and studied, and the capacitor manufacturers would have data on it. The military and aerospace industries would require it. They do not. This break-in phenomenon is not a property of capacitors. It is not real.
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