For how long will you be billed if you run an on-demand Amazon EC2 instance for 4 hours, 5 minutes, and 6 seconds?

When you run an on-demand Amazon EC2 instance, billing is typically calculated based on the total time the instance is running, rounded to the nearest hour. Amazon EC2 instances are billed in hour increments, and any partial hour is rounded up to the nearest hour for billing purposes.

In this case, you have an instance that runs for 4 hours, 5 minutes, and 6 seconds. Although the instance runs for an additional 5 minutes beyond the 4-hour mark, the billing policy means that any time beyond the full hour is still considered part of that hour. Therefore, the charge will only cover the complete 4-hour increment, as the additional time of 5 minutes and 6 seconds does not accumulate to another full hour.

As a result, the correct billing duration for the instance running 4 hours, 5 minutes, and 6 seconds is simply 4 hours. You would not be charged for the extra time, making it the accurate choice for the billing period.