The Spot Console displays running hours for instances under the Savings tab. This metric may differ from AWS calculations, and understanding the reason for this discrepancy is important when interpreting usage data.

Running hours are calculated from the moment instances are launched until they are detached, not terminated. By contrast, AWS calculates the entire lifetime of the instances.

If groups have long draining periods or shutdown scripts with extended grace periods, there can be noticeable differences in totals between Spot and AWS consoles.

To minimize discrepancies between Spot and AWS calculations:

• Review and shorten draining periods configured for the group when possible.
• Optimize or reduce time in shutdown scripts to limit prolonged grace periods.
• Confirm lifecycle hooks and termination policies align with your expected reporting behavior.

Outcome

Users can better interpret running hour metrics in the Spot Console and take measures to reduce large variations compared to AWS.