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We should mention that it is recommended to run TTL after every 4 hours due to gc.ttl being set to 4 hours here:
https://www.cockroachlabs.com/docs/stable/row-level-ttl.html#control-how-often-the-ttl-job-runs
Another thing we should update is that TTL uses admission control. On a cluster with no foreground traffic and a large TTL delete workload, we will see high resource usage by the TTL job. This is normal, and should there be foreground traffic, admission control will automatically throttle TTL to provide more resources to the foreground traffic.