@douglas_schroeder Thank you for your introduction and background.
You say you have the blessing of many gear coming your way. This is actually a bad thing in regards to burn-in. To understand or notice burn-in, you need 2 attributes:
1) Be very familiar with the sound of a system, so when a new component is switched in, you understand the change and the change over time. In order to notice change, you must first know what is changing.
2) Burn-in time varies greatly. Anywhere from X up to 300 hours, some high quality gear even require 500 hours. If you listen to music 3 hours a day, it can take up to 100 days to complete a 300-hr burn-in. A challenge for someone with access to a lot of gear.
3) This is a bonus. The best way to identify burn-in is not by listening for change. Listening for change is very difficult. What you should do is to listen for what is bad with the sound. If you cannot identify what sounds bad, you are not ready for burn-in evaluation. Once you have identified the bads, you start listening for when the bad traits diminish. That’s how it’s done.
If you want burn-in evaluation the easiest way, have 2 identical products but one with many hours on it, the other brand new.
Another note, keep in mind what makes up good audio sound also involves roughly 30%-50% of things we don’t hear and don’t want to hear. When you know, you know.