seems as though its a good idea to disassemble a gun and inspect it after every use.
From a practical standpoint, it is not always possible or easy to disassemble, clean and inspect after each use (at least not immediately after). Thorough cleaning and inspection can allow you to be forewarned of some impending issues, particularly if you notice significant wear on sliding or bearing surfaces. You might also notice cracks in frames, forcing cones, etc... before they let loose catastrophically. Fortunately, with quality arms the vast majority of us aren't likely to ever see such issues with our guns, but these issues do still occur.