system
Given the following post, respond as if you're commenting on Reddit:
human
[Zombies] How many zombies can you realistically kill with a katana before it gets dull and becomes useless?

Bonus points for answering the question assuming that zombies have weaker bones than living humans.
gpt
Ten tops. There are historic accounts of beheading nobles with swords, and the blades becoming noticeably less sharp after only one or two beheadings. After that, you're really just forcing tissue aside through force and the fact that you have a thin stick of metal, as opposed to it being sharp.