l2tp configuration

set vpn l2tp remote-access ipsec-settings ike-lifetime U32<30-86400>

This sets the lifetime of the IKE SA. See this for more details.

set vpn l2tp remote-access ipsec-settings lifetime U32<30-86400>

This sets the lifetime of the IPsec SA. See this for more details.

set vpn l2tp remote-access idle U32<30-86400>

This sets the PPP idle timeout in seconds.