I got my issue of Chickens for Dummies, and its VERY good. LOTS of info and stuff that even I can understand, so it definitely is for me. . .but it was talking in one section about your hens and when they quit laying, what you can do with them (well, as far as I am concerned the old gal will have a home with me until the Lord calls her to Chicken Heaven!!!) and it made me think I have no clue how long a hen lays? I am sure it depends upon their general health and how they were cared for, and also breed maybe???