Based on my experience with the NCF outlets, they take about 400 hours to settle down and at least 600 hours to run in. Before settling down, expect the unexpected as the sound will drastically vary each day.
Furutech GTX NCF receptical break in, how long
Bought NCF with 6 day burn from seller. I have it burning in last 5 days on 2 cheap power bars with old desk top towers, fans, TiVo box, home theater amps. My amp and Preamp, phono stage and CD player are all tube so I don't use them. Ran system on outlet tonight and no bass, bright, sounds bad. First day with outlet it sounded very nice. Any owners of rhodium outlets can tell me what I'm in for time wise, or what to expect sound wise in next couple weeks, thanks