I was just wondering how long on the average does coroplast last. I at the moment have a cage for Dillion my daughters male guinea pig, it's made up of a large clear plastic container that's aprox. 2 grids wide by 3 grids long, the sides are about 4-6 inches----so far it's made a great cage. I had a cage while we lived in Illinois that was made with coroplast aprox. 3 x 5 grids, I think he was so bored he wasn't sure what to do. After about 9 months I brought it down to aprox. 2 x 3 and he seemed to move around more and enjoy more. However I'd love to get more grids or use the left over ones and make him a second story for hime to have a little more room.