I don't agree that a century is "a few decades", my understanding of a "few decades" (and I believe, the person who was discussing this problem with me) is no m

I don't agree that a century is "a few decades", my understanding of a "few decades" (and I believe, the person who was discussing this problem with me) is no more than 50 years. If you are clearly talking at the time scale of a century, I'll have no problem with this statement.