I don't know how long I put in over one weekend, but I was camping him recently and I'm up to 42 courier spawns with no drop.
It's like.. idk. 15 hours of constant killing. I think it's a 22 second respawn, so one mob every 10 seconds or so. And god help you if you get drowsy or distracted for a moment and miss the spawn. The mob patrols instantly upon spawning and there's dozens of other mobs roaming around in the same area.
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