Check the spawn2 table. Respawntime and timeleft are the things you're looking for.
For any given spawn point, there can be different mobs that spawn at it, but only ever one at a time. When whichever is up is killed, a value is written to timeleft equal to the respawntime value. It'll look different, since it's in milliseconds. It'll count down until it reaches 0, at which point a new mob will spawn.
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