In the UK its 33% discretion before action has to be taken (over the season)
I once did 100% discretion on a DC10 flight to Tenerife with a 1hr turn at TFS (as the aircraft was covering a B757 flight). The main reason was the flight went at 0555z which was a crap reporting time - no chance of a delay to 0600z due slots. At the end of the season Commercial rang me and said they had changed the times for the next summer - much excitement - until they told me it was going at 0550z instead
I guess the question is instead of venting on the forum why not just ring someone up and ask?
I suspect Xulu has hit the nail on the head. Does the Commander take the last break?