public void setPhase1LifetimeSeconds(Integer phase1LifetimeSeconds) {
        this.phase1LifetimeSeconds = phase1LifetimeSeconds;
    }
<p>
The lifetime for phase 1 of the IKE negotiation, in seconds.
</p>
<p>
Constraints: A value between 900 and 28,800.
</p>
<p>
Default: <code>28800</code>
</p>

@param phase1LifetimeSeconds
       The lifetime for phase 1 of the IKE negotiation, in seconds.</p>
       <p>
       Constraints: A value between 900 and 28,800.
       </p>
       <p>
       Default: <code>28800</code>
aws-java-sdk-ec2/src/main/java/com/amazonaws/services/ec2/model/VpnTunnelOptionsSpecification.java