DAC break-in question

So the answer is pretty simple -

running streamer into DAC (try to set up a playlist consisting of music with different bit rates and set it on repeat) without your amplifier on: you’re breaking in the digital in, power supply and the DAC section. You’re not breaking in the output section. To do a full end to end break in your amp or preamp that DAC is connected to has to be on. You can choose to break in the analog out section while listening and keep the digital front end running 24/7 with amp off and it will take a few days more. The digital section and power supply break in will be typically around 200hrs.
Or bite the bullet and keep the amp on for few days. When amp is off the signal from DAC analog out is not flowing. 

OK, so follow on question… do each of the inputs & outputs need to be burned in? IE: new pre… separate burn in required for phono line in, DAC in & HT in? Separate burn in for output to amp & headphones? Same question for a DAC, streamer in, CD in. How about each filter? I think the answer is yes, except perhaps the filters… but maybe even them. And then for how long? I don’t think my CD portion of my system will ever be burned in. 

Someone needs to explain the science behind electronic components needing to be “broken in.” I’m not denying that the phenomenon exists, I just don’t understand the science. 

There is some science and physics behind the break-in of electronics, but it has been taken way too far by people not understanding how minor it is and the reality. You do not need to break-in a component before listening, that's silly. Just plug the damn thing in and enjoy it. You must have the full circuit complete to break-in anything in the system as the circuit needs to be complete. Stop overthinking this, just play it and it will break-in with normal use. Don't expect some magical change.

I agree. In my experience if I hated how a cable or a component sounded right out of the gate no amount of break in could help.