Define proper 
I did burn-in FD7 for about 50-60 hours before listening. The rest did not deserve such royal, rare treatment! I don’t recall ever hearing a burn-in difference yet with IEMs or headphones, outside of the initial first hour or so, possibly. Tips, definitely. Cables, slightly.
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Hmm I would say at least 100 hours.
That’s what you can read here and there
Some say 150Hrs for the H50, no idea if that’s correct
Have you ever heard any burn-in differences yet, with IEMs, earbuds, or headphones?
100 hours PER IEM is a long damn time to wait around… #_#
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I don’t have much experience with a lot of different IEMs but the perceived sound of my Kinda Lavas definitely changed in the first two weeks or so… Don’t know if it was brain or driver burn in though 
I won’t deny possible effects of burn in but also I am not a full believer, I just don’t know what is true and what not…from my feeling I would say it is possible that the sound could change after such long burn in time
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