accustomed to a headphone/iem change, when you swop between your chosen weapons…P1’s for example shock me every time I first put them on but 10 minutes down the line then i’m yeah baby…swop them for the Phantoms 
dark but then another 10 minutes in i’m like 
and enjoying the music?
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Depends on the headphones/iems and how I’m feeling and what I am listening to. Also whether I need to actually evaluate something or just for enjoyment
Aye it’s funny i’ve not listen to headphones for a while just a couple of iem’s but i’m loving the headphones again now the weather over here has got cooler…think I still prefer iem’s tho unless the boat and wallet can accommodate a nice analogue, tube, speaker system mind…sorry i’m oldish lol.
Well if I am going to say how long, for me I guess as the time goes by the headphones or iems will grow on me like I did not even noticed. It’s like when I just I got the MH751 back then after my M40X unfortunately died. It took me awhile to finally love the sounds of the MH751 due to the fact that I was stuck and still loved the sounds of M40xs that I used to own. As for the IEMs well, I grew to love the T2s and ZS10 Pros than my first IEMs which are the SE215s for the sounds of the 2 imo are better than the SE215s for I was able to notice the difference of sounds after a long listening with my 215s when I used to only own these for use.
I can’t say I have needed an adjustment period when I swap between headphones. but then, none are uncomfortable or have any issues. I could see perhaps that happening if you’re swap out has a huge difference in the sound profile…such as going from something bass heavy to something treble peaky.