The mechanics of break in for electronics is simply the gradual formation of stable electric fields in the insulation material that is in contact with the conductor. It takes time to form, depending on the voltage applied and the type of insulation. Likewise, the fields built up during use will dissipate with lack of use and require repeating break in again. Some insulation materials like teflon require longer time to establish a stable electric field while others like cotton require less time.
Transformers and caps in power filters have a lot of dielectric material in contact with the conductors, so maybe it will take some time for the UberBuss.
My outlook on break in is that you have already bought it, and you're not sending it back for a refund, so it really doesn't matter when the break in ends. You can't speed it up, so there's no point worrying about it, unless you are gear oriented audiophile who enjoys observing how machine changes over time. For me, that perspective is too far down the rabbit hole. It just doesn't matter when there is music to focus on instead. The system is as good as you can make it, so just ignore the break in. Maybe you will notice it change, maybe not. It doesn't matter, it is what it is. And it will probably get even better with break in. If it doesn't who cares? Hopefully inserting the brand new component will immediately sound better than what it's replacing, because any improvements due to break in are usually minor compared to the overall performance improvement potential of a given upgrade. If you don't hear strong indications of the improvement on the first impression of brand new unbroken component, then it probably won't get that much better after break in. You should be able to hear most of it on the first listen.
For loudspeakers it is totally different, because the drivers need physical exercise to break in, and this drastically effects performance potential. Speakers usually need just 100 hours, whereas some caps will take 500 or more. But dielectric break in is not that big of an effect as loosening driver suspension. The better quality of the dielectric (teflon) the longer it takes to charge it, so the longer the break in and the more dramatic the improvement caused by the break in. Teflon caps can sound very bad during charging as partially charged fields affect the signal negatively.