Primary source for the 17% number (although dubious considering it was 1,010 people online via Amazon's Mechanical Turk, and to qualify participants were required to be sexually active and enjoy listening to music):
You need to take them out every 2-4 hours for charging.
I've noticed a lot of people wearing just one, my kids included. They explained to me that by alternating earbuds they can wear them almost continually.
This sounds like the plot to a Dystopian tech movie. Something always in your ear... whispering.
We're only getting warmed up. Wait until they're invisible, or implanted in your skull.
Someone call Charlie Brooker!
The Seashells from Fahrenheit 451 fit into users ears like thimbles and they'd be worn into the night, lulling users to sleep.