mkrawcz, from my personal point of view, I doubt it’s going to take that long to break-in / warm up most things don’t take that long in my experience.
Is it a different sound to your BHK? Don’t forget your BHK is your reference point and what is mainly changing is you getting acclimatise with the sound of the new kit.
It’s like trying a drink or new food, your first taste is oh what is this then by your second taste your taste buds know what to expect and you begin to get a feel for whatever it is, good or bad.