I have the tube for 10 days, and it is to watch for leaks. I have to drink green koolaide 3 times a day and if green comes through the tube there's a leak. I am also on clear liquid for 2 weeks for safety I guess. Just know after 18 days on liquid diet before surgery and now 2 weeks liquid without protien shakes after surgery I feel like I'm going to starve to death. Difference is I'm too scared to eat. So won't mess this one up:)