If the instance name is new, instantly. (As long as nobody queries it prior to the record getting created, of course.) Otherwise, the TTL. We use either 1 or 5

If the instance name is new, instantly. (As long as nobody queries it prior to the record getting created, of course.) Otherwise, the TTL. We use either 1 or 5 min TTLs where we expect changes for exactly this reason, and in practice, it isn't a problem.