I've got beats in-ear headphones. They manage to block out enough noise for me not to unwillingly listen to someone else's conversation. How many consecutive ho

I've got beats in-ear headphones. They manage to block out enough noise for me not to unwillingly listen to someone else's conversation. How many consecutive hours can you wear headphones though? I don't think that having something stuck in your ear for 40+ hours a week brings any health benefits.