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Repeat Interval
If you want to control the time between each repeat you can provide repeat-interval as well.
On this page

Examples
1
1.5
0.5
2
1e4
(Random value between 1 to 4)- Leave it
blank
/empty
to start right away
Its not mandatory field. if left blank extension will start executing right away.
Repeat value is mandatory for Repeat Interval.