From my experience with my Benz cartridge, expect a significant improvement in the sound of your Glider around the 50 hour mark or so. It'll keep improving subtly after that, but the first 50 hours is a huge night-and-day improvement - the bass will become more full, the sound overall will get "bigger", in my case there was some of that "s" sibilance at first that disappeared around hour 50...all in all, much more dramatic changes than what I've noticed with any other equipment.
I guess the easiest description would be to say that it improves significantly in refinement throughout the break-in period.
I guess the easiest description would be to say that it improves significantly in refinement throughout the break-in period.