What is a relevant factor in determining per diem allowances across the international dateline?

The correct answer focuses on actual elapsed time, which is crucial in determining per diem allowances when crossing the international dateline. When service members travel internationally, particularly across this line, they experience shifts in time zones that can significantly impact the duration of travel. The elapsed time reflects the hours of travel, which effectively influences the length of the trip and the associated allowances.

For example, if a service member travels for a long period due to varying time zones when crossing the dateline, the per diem may be adjusted to reflect the actual time spent en route. This can include additional allowances for meals and lodging based on the duration of travel as it accounts for the reality of the travel experience rather than just geographical considerations or distance.

Understanding the role of elapsed time is critical, as it ensures that service members receive fair compensation that aligns with their actual travel experiences, acknowledging the challenges associated with such travels across different time zones. This is why actual elapsed time serves as a relevant factor in determining the appropriate per diem allowances in these scenarios.