system
Given the following post, respond as if you're commenting on Reddit:
human
[Death Note] Why do Shinigamis need to constantly kill multiple humans in a short timeframe if the years of each victim gets added to their own? Surely one human every 10-30 years would be sufficient or is there some kind of exchange rate between human and Shinigami lifespans?
gpt
Shinigami are *incredibly* lazy. Like, lazy enough to almost die because they let the clock run down.

So when they realize that they haven't killed anyone in ages, they go and "fill up" by whacking a whole bunch of people. Then they go back to being lazy.