The TTL performs a sleep of the amount of seconds configured before waking up and performing a pass. This causes new config changes to only be picked up after the previous amount of seconds have passed.

This opens up the possibility of a TTL being erroneously set to a very large number of seconds and be unable to fix it unless you wait or restart the server with the new settings. In other words: if I start the server and change the TTL monitor sleep seconds from 60 to 1 the server will still wait the full 60 seconds after setting the value before using 1.