Terri. I am (for the first time) doing the Tobi for two weeks on, two weeks off. On the three times I've done it before it was always for 28 days. I always have lost my voice on day three but with gargling salt water I can sorta get back to a growly voice after a week. Thanks again for all the good info. There is an old saying, "A wise man knows it is better to learn off the bumps from someone else's head." That's what we do here.