Accepted Answer
This shouldn't be showing up as an error message in the Console. Did you mean its an email notification message? The execution time threshold message comes from a Response (for the job or one of its steps) that has an event for "Execution time reached a threshold". You need to find that response and remove it.
Accepted Answer
It's the "If Task runs longer than the specified time then Send notification with automatic subject". There is a bug in your version that causes it to select the wrong event ("Before task is killed") when you edit the event, but the description is correct and it is using the time threshold. You need to delete that response if you don't want the notification, or change the time limit as appropriate if you still do. If you edit the event to change the time limit, you will need to change the selector to the "Step execution time reached a threshold" option since it shows the wrong thing.