+If you must change it (and it may be useful for internet connected nodes
+on dynamic IP addresses that go away after a set time of usage) the time
+can be specified as:-
+
+ 5 which if less than 30 is converted to minutes otherwise is
+ taken as the no of seconds between pings.
+ 120s 120 seconds
+ 5m 5 minutes
+ 1h 1 hour
+
+Please be aware that this causes traffic to occur on the link, setting
+this value too low may annoy your neighbours beyond the point of
+endurance!
+
+You can switch this off by setting it to 0.
+