rest assured that the DV-50(S) is built very well and will easily handle many more hours than just 400.
Hello Dlbd - I'm not questioning the overall build quality of the DV-50S. Nor do I think that a DV-50S can't handle 400 hours of total playing time. That's not at all what I was referring to.
The post I responded to recommended "break-in" via 400 hours of UNINTERRUPTED playback. I do not think it was designed for this. I don't care how good the build quality is, it's still an electromechanical device with a limited lifespan. 400 hours of uninterrupted playback isn't break-in, it's accelerated wear.
So, if this has been the standard "break-in" regimen that most DV-50S owners have followed, I won't be buying a used one. That was my point.