The default TTL is 20 seconds (and can be overridden by a system property called minion.properties).
On a customer installation, while trying to troubleshoot a communication problem between OpenNMS and Minion, I found that when you override the TTL through the "collectors:collect" command, it is not taken.
Interestingly, if you do the same through "poller:poll" it works.
That means, the problem is the "collectors:collect" command.
If I change the global system variable that controls the TTL it works, but as this requires a restart, it would be nice to fix the collections command, as it is precisely a data collection problem, what I'm trying to troubleshoot at customer side.
I've verified the problem on a controlled lab using Horizon 22.0.4. I'm going to verify the same with latest Meridian 2018 and report back.