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Directed time refers to the hours which you can be asked to work during the academic year.
All members in maintained schools and academies are covered by Instruction 10 of the NASUWT National Action Instructions, which states:
Members are instructed not to attend any meetings outside school session times which are not within directed time and where there is no published directed time calendar which has been agreed with the NASUWT.
Now carry on reading at the NASUWT site and calculate your own hours using the free to download Directed Time Calculator.