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"The World Health Organisation recommends the 60/60 rule:
that you listen to your personal music player
for no longer than 60 minutes at a time
and at no more than 60 per cent of its volume. "
LINK 
http://women.timesonline.co.uk/tol/life_and_style/women/the_way_we_live/article3948609.ece
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(￣□￣;)!!
NO LONGER THAN 60 MINUTES ? ? ?
I use headphones for more than 3 HOURS ! ! !
Geez. . . .
I need to change my listening habits. . .