Thanks. I've happened to have aquired quite a pile of them and thought they might be like brown corrugated cardboard that I've found breaks down fairly fast if kept wet. Fairly fast as in a year. I'm thinking about trying the lasange method.
Yup; everything rots. I find that brown paper bags rot pretty quickly when I use them in the lasagna method--like maybe a couple of months. Of course, it depends on the presence of moisture and warmish temperatures. When I use them in lasagne-beds over the winter, they are all composted by planting time around here: late May.