public void setSessionDuration(int sessionDuration) {
        this.sessionDuration = sessionDuration;
    }
Set the duration of the session credentials created by this client in
seconds. Values must be supported by AssumeRoleWithWebIdentityRequest.

@see com.amazonaws.services.securitytoken.model.AssumeRoleWithWebIdentityRequest 

@param sessionDuration
             The new duration for session credentials created by this
             provider
aws-java-sdk-sts/src/main/java/com/amazonaws/auth/WebIdentityFederationSessionCredentialsProvider.java