hey ok, there are alot of tricks to finding a lost corn. First I'd like to say never lose hope, it could be found today, or it could pop up 6 months from now.
If this corn just escaped than it is probably still in the same room as its tank. what many people suggest is to shut the doors to the room, and line the walls with a powder like flour. Your corn will most likely move along the walls and this will help you follow its tracks.
Then, under each door, lineup tooth picks or again flour. This will let you see if you corns has move out of the room.
As far as traps, I hear a good way to go it either put out little hides with meals in them, or put out 1 liter coke bottles with meals in them. This way when the snake eats, he won't be able to leave.
As far as how long a meal will last out, I'd say 24hrs, but use your best judgement. If it stinks real bad then it might be bad.
Again, best of luck and try not to worry too much. These things often work themselves out
