You could also say: "...has taken its toll." Since eight years ago is the past, the present-tense is is a little bit sloppy. "Has taken" connects the past (eight years ago) to the present. (This is the present perfect tense.)
It depends on your exact meaning. You could also say: "Working in the same place for eight years takes its toll." That would mean that working for eight years anywhere always takes a toll.
[I edit copy and have tutored college writing.]
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