<p>The maximum session duration (in seconds) that you want to set for the specified role. If you do not specify a value for this setting, the default value of one hour is applied. This setting can have a value from 1 hour to 12 hours.</p> <p>Anyone who assumes the role from the CLI or API can use the <code>DurationSeconds</code> API parameter or the <code>duration-seconds</code> CLI parameter to request a longer session. The <code>MaxSessionDuration</code> setting determines the maximum duration that can be requested using the <code>DurationSeconds</code> parameter. If users don't specify a value for the <code>DurationSeconds</code> parameter, their security credentials are valid for one hour by default. This applies when you use the <code>AssumeRole*</code> API operations or the <code>assume-role*</code> CLI operations but does not apply when you use those operations to create a console URL. For more information, see <a href="https://docs.aws.amazon.com/IAM/latest/UserGuide/id_roles_use.html">Using IAM roles</a> in the <i>IAM User Guide</i>.</p>