Normally operation times are taken from the Qty per run/Run time field when the works orders or recommendations are generated. You may want to change an operation time to accurately reflect the time being spent on the shop floor.
Note: This should only be done if there is a change that applies to a short term period, such as a shiftA working period identified as a calendar state. or day. Longer term changes in process time should be controlled in the Bill of Materials module.
The modified operation time will be replaced with the original Qty Per Run/Run Time defaults from Manufacturing the next time you Get All Data or Get Orders/Recommendations.
The End Date in Manufacturing Works Order/Recommendation will be updated with the Graphical Planner modification, provided the user performs a Send Data operation after the modification. This will remain changed until the next Send Data update from Graphical Planner.
Open: Manufacturing System Manager > Operations Register > Records > New Operation or Amend Operation | Details.
Double-click on the desired operation in either the Overview or Unscheduled Operations windows.
The Edit Orders Information window appears.
Click Edit alongside Operation Times.
The Edit Orders Operation Times Information window appears.
Click the Validate Schedule 
icon on the Main toolbar.
This identifies any errors.
Click the Repair Schedule 
icon on the Sequence toolbar.
This repairs any errors.
Click the Save 
icon on the Main toolbar to record any changes.
Other tasks
Analysing late or at risk orders and operations
Locating orders and operations
Reference