Originally Posted by Triguy
The amount of time it takes really depends on the corrosive elements in your water supply(ies). My current rod looks pretty good even after two good years of camping.
You can also extend the life of your rod, by draining your water heater when not in use between camping trips....instead of letting the anode rod stay submerged in water during idle time.
Just looking at the pic, it seems your rod is getting weak near the threaded end. As cheap as the rods are, I would probably go ahead and replace this one since you got it out.
As the rod does it job and deteriorates, it leaves pieces and residue inside your heaters tank, that needs to be flushed/cleaned every so often.