This object only exists (is instantiated) when the standby interface's health isn't being actively monitored, and it sets the minimum number of seconds the device waits between successive switchover attempts when both the working and standby interfaces have gone down and the device is essentially blind-searching for whichever one comes back up first. Because a backoff algorithm should increase the interval between successive attempts, this value specifically sets the starting point of that backoff, not a fixed retry rate -- too aggressive a minimum here would cause needless rapid switching attempts when both sides are actually down. For example, setting this to 5 seconds means the very first retry attempt after both interfaces fail happens after just 5 seconds, with subsequent attempts backing off to longer intervals up to the configured maximum.