unmapVmfsVolumeEx_Task timeout after 30 minutes

Hello,

I'm struggling with running UNMAP from vRO against VMFS LUNs, while in case of bigger LUNs, which task takes longer that 30 minutes, which is somehow default timeout value.
Once after 30 minutes vCenter task triggered by but action time out, I do not have any information if and when UNMAP process ended.

Is there a way how to modify timeout of triggered VC:Task ?

I've already tried following:

TASK = unmapHost.configManager.storageSystem.unmapVmfsVolumeEx_Task(dsUuid);

TASK.createEndOfTaskTrigger(3600);

But it seems VC:Task modification does not returning any error, but also having no effect in terms of when task in vCenter will timeout.
For example, if I will try: TASK.createEndOfTaskTrigger(15);
I would expect, that vCenter task will timeout in 15 seconds, but it is not the case.

Regards