Most folks will never wear out 100 ft of chain on a saw. Unless of course they change chains out like tissues and never sharpen.
Hey MM, if you're cuttin in the dirty beech & yard birds like I have been lately you can burn up a 100' roll in a couple years when you've got 4 - 5 saws that use the same chain. If the yard birds don't get ya the fence row trees will.
A C