The timing I believe is around morning when the Terraria NPCs arrival which requirements are met (I'm not sure about respawning). But has anyone been keeping track on the exact time they arrive?
2 Answers
If its daytime it will usually will have 1 NPC every 2 Minutes.
If its night time the NPCs will not spawn.
However it also affects if a bloodmoon has happened. If a Bloodmoon has occured the NPC will not spawn for the first 10 minutes of the day after.
Officially Day starts 4:30 game time
About 5 NPCs spawn a day on the mobile version of Terraria and after a bloodmoon they will not spawn in pre-Hardmode.
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1NPC's do spawn after a blood moon. Can I ask where you got that info from?– RobbieFeb 3, 2020 at 17:40