Here is an interesting article from Duke University about taking voice breaks:
It's important for those who speak a lot in their jobs to take regular breaks from speaking to avoid vocal strain and vocal injuries. For more information about healthy voices, visit my website: http://www.allaboutvoice.com/.
From Beth Lawrence
If you're serious about singing then you've got to take care of your voice. Here are some healthy ways to do that!
Beth Lawrence, Award-winning singer, songwriter and author of "From Shower To Stage...7 Easy Steps for Singing Like A Pro!"