You need to have an actual trigger (e.g. 6pm everyday) for your task, otherwise "wait for idle for" does not make sense.
Now you read it as:
At 6pm everyday, if the computer is not idle yet, wait for another 1 hour to become idle.
If it becomes idle within that time, let it be idle for 10 minutes and then the task gets started.
If not, the task will not be triggered.
See also: learn.microsoft.com/en-us/windows/win32/taskschd/task-idle-conditions