Never quite understood how hours can be factored for augmented crew given that the OM-A says that:
Augmented Crew Responsibilities include (but are not limited to):
• Participate in Pre (&Post) flight Briefings and Flight Planning.
• Participate in flight deck briefings and to actively monitor the flight path
of the aircraft and actions of the PF [pilot flying] and PNF [pilot not
flying].
• Maintain a situational and operational awareness.
• Bring to the attention of the operating crew any abnormalities or
departure from SOPs and previously briefed intentions.
• Duties delegated by the PIC [pilot in command].
• Care must be taken to ensure that no aspects of any
operational responsibilities are overlooked.