The time it takes to go from “flash to bang,” is an allusion to the time between a round impacting on target and when an observer hears the sound of that impact. Essentially it’s a low tech method of determining the amount of distance between you and whatever caused the bang. There are vagaries such as terrain and weather that intervene, but in principle sound travels at about 350 meters per second, therefore if flash to bang is 2 seconds, you’re 700 meters away – and that probably makes you way closer than you want to be to whatever is being pummeled.
In common usage down on the cube farm, flash to bang is used to mean the time between when you make a decision to the time that decision reaches fruition. The flash to bang on wanting a cup of coffee to getting that cup of coffee is generally very short. For other seemingly mundane tasks which seem like they should be accomplished quickly, such as publishing things to a website or getting a memo signed, the flash to bang could be months.
There’s no good reason for it, but as a professional lifetime spend tending to such things has taught me, that’s just the way it is. The lesson here, perhaps it’s the Zen of the Bureaucracy, is to try not to take it personally, shun emotionally entangling yourself with however long “the system” takes to do something. As a cog ex machina you don’t have any actual control over those things. Like terrain or weather you can influence them a bit around the margins, but getting from flash to bang is just going to take however long it takes.