The duration of a production operation is calculated using data from both the routing and the work center. The routing specifies the sequence of operations and contains the standard values for each operation, such as setup time, machine time, and labor time. The work center, where the operation is performed, contains the formulas in its scheduling tab. These formulas use the standard values from the routing and the operation quantity to calculate the exact execution time, capacity requirements, and costs. Therefore, both master data objects are essential for determining an operation's duration.

B. Material master: The material master's "Work Scheduling" view contains the total in-house production time, which is an aggregate value, not the duration for a specific, individual operation.

D. Production version: A production version is a link that determines which Bill of Material (BOM) and routing to use for a specific material. It does not contain the time values itself.

1. SAP S/4HANA Help Portal - Routings: "In an operation, you enter standard values. These are planned values for the execution of an operation... The system uses the standard values in formulas in the work center together with the operation quantity to calculate the execution time, capacity requirements, and costs of an operation." (Source: SAP Help Portal, S/4HANA 2023, Routings (PP-BD-RTG), Section: Standard Values).

2. SAP S/4HANA Help Portal - Work Centers: "On the Scheduling tab page in the work center, you enter data that the system uses for scheduling operations... You can enter a formula for each standard value that is used to calculate execution time, capacity requirements, and costs." (Source: SAP Help Portal, S/4HANA 2023, Work Centers (PP-BD-WKC), Section: Scheduling Data in the Work Center).

3. SAP Learning - Course TS422 (SAP S/4HANA Production - Planning): The course materials detail that operation duration calculation is a function of the standard values maintained in the routing operation details and the formulas defined in the assigned work center's capacity and scheduling views. (Source: SAP Training Course TS422, Unit: Master Data, Lesson: Routings and Work Centers).