You can do this with just two trigger nodes if you like
[{"id":"c21f81fa.7ccbf","type":"inject","z":"a992b717.c41468","name":"","topic":"","payload":"stop","payloadType":"str","repeat":"","crontab":"","once":false,"onceDelay":0.1,"x":170,"y":900,"wires":[["bb39e73d.60c5b8"]]},{"id":"bb39e73d.60c5b8","type":"trigger","z":"a992b717.c41468","op1":"1","op2":"0","op1type":"str","op2type":"str","duration":"-3","extend":false,"units":"s","reset":"stop","bytopic":"all","name":"","x":360,"y":860,"wires":[["84390cdd.5cbe9"]]},{"id":"5170e53b.b2070c","type":"inject","z":"a992b717.c41468","name":"","topic":"","payload":"start","payloadType":"str","repeat":"","crontab":"","once":false,"onceDelay":0.1,"x":170,"y":820,"wires":[["bb39e73d.60c5b8"]]},{"id":"84390cdd.5cbe9","type":"trigger","z":"a992b717.c41468","op1":"1","op2":"0","op1type":"num","op2type":"num","duration":"1","extend":false,"units":"s","reset":"","bytopic":"all","name":"","x":540,"y":860,"wires":[["cbd3f15b.a52a3"]]},{"id":"cbd3f15b.a52a3","type":"debug","z":"a992b717.c41468","name":"","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"false","x":710,"y":860,"wires":[]}]
the first set to repeat (until stopped) at the overall time period you want - and the other set to do a trigger for just the on period.
