I am a little bit confused about the FIFO execution mode and its behaviour.
For example, a coordinator "C" generates 4 instances of a Worfklow at those nominal times :
8:00am, 7:45am, 7:30am, 7:15am
For example, considering they are waiting for resources (a flag file for example) until 8:07am (the flag is available), I note that the 8:00am instance is executed first. And when it is done, 7:15 is executed, then 7:30 then 7:45.