Stop full flow with node



I have a flow with a lot of waits. the full flow takes up to an hour. (and that is exactly what it should do)
sometimes by accident the flow starts. and i need to wait the full hour to undo all steps.

I was thinking to add a switch node with a flow variable that will stop the flow.
however that will take me a lot of switch nodes. is here a way to stop the full flow without stopping node-red itself?