LookAtTarget overrides Behavior#timedOut, which means you cannot set it to run for a set duration before terminating via ExtendedBehavior#runFor.

In my personal use-case, I was attempting to make LookAtTarget work more like vanilla's LookAtTargetSink, as I was having issues with a mob never changing its look target through idle look behaviors predicated on the absence of a look target. Given the example of SBLSkeleton, which sets a runtime duration for its LookAtTarget via runFor, I expected that would help fix my issue, before investigating the source and seeing the method override. I had to resort to making a new version of LookAtTarget that allowed timing out.

There are a handful of other stock behaviors provided by this mod that override timedOut to return false, which effectively no-ops runFor for them. A suggestion would be to introduce a couple of builder methods in ExtendedBehavior to disable and enable timing out, changing a boolean field that handles calling super.timedOut in ExtendedBehavior#timedOut. You can then call the disable method in the constructors of these stock behaviors intended to not time out by default. This would allow devs such as myself to re-enable timing out after instantiating one of these stock behaviors.

Done

1.12.1 Adds the noTimeout method in ExtendedBehaviour, and I've remapped all of the behaviours that overrode timedOut to utilise this instead so that it can be configurable