Hello Raf, My experience could be different compared to others. In my case, improvements appeared on frequency edges, details, and sound definition of each instrument, more openness on treble and midrange and more weight on bass.
Chris Vanhaus (vhaudio) suggested perhaps this period of break-in FI-11 might take around 200 hours. In Some sites, some other people mentioned a period of 400 hours and more!!! But I guess this is more likely for Furutech cables than connectors.
Up to ~180 hours, I used a NEMA to IEC adapter with a small ventilator for break-in period. I thought the sound would be perfect but afterward ( >220-250 hours) I heard more refinement, especially on instrument placement on stage, more smooth transition on frequency bands and more treble registers appearing on music.
Hope this would help.
Cheers,
Michel