Have not done a back to back but I have done one week, took a week off, then returned the third week. Someday....
Good people sleep peaceably in their beds at night only because rough men stand ready to do violence on their behalf.
Courage and perserverance have a magical talisman; before which difficulties disappear and obstacles vanish into the air.
Pick your company wisely! Hang around people who are going to help you become all God created you to be.