Replication :: Setup Schedule Push To Propagate Transaction Every 5 Seconds

I have a multimaster advance replication environment and we have less than 10 transaction per day...I want to propagate data as soon as possible like sync if I setup the schedule push to propagate transaction every 5 seconds as below

BEGIN
DBMS_DEFER_SYS.SCHEDULE_PUSH(
destination => 'orc2',
interval => 'SYSDATE + (5/60*60*24)',
next_date => SYSDATE,
parallelism => 1,
delay_seconds => 10);
END;
/

in other hand ,book(I mean Advance Replication) has written that for simulating continuous push we should setup it as below so it will propagate transaction every 1 minute.

My second question is:I know interval >= 'SYSDATE + (1/144)' means every 10 minutes a job will start and delay_seconds => 1200 means each job remain aware for 20 minutes, but I can't understand the logic?why it can simulate 1 minute propagation?

BEGIN
DBMS_DEFER_SYS.SCHEDULE_PUSH(
destination => 'orc2',
interval => 'SYSDATE + (1/144)',
next_date => SYSDATE,
parallelism => 1,
execution_second >= 1500,
delay_seconds => 1200);
END;

My thrid question is :Which of the above setups is a better solution for my environment?