Whenever you see a fly, and it's flying frantically, you think to yourself "it'll get tired, that's when I'll strike", but you realize it's taking too long and you get impatient. 6 hours. That's the length of time it can stay flying for; 6 hours. You also might think "I'll leave the fly alone, it'll die out within the week". Maybe you've thought like this, but even this is not legitimate. They can survive for months.

flies are so annoying

do they even do anything for the environment? the only thing i can think of are being detritivores, but do they actually eat the dead matter, or only lay eggs like bastards

Frogs eat flies and frogs are nice

Also spiders but spiders are a necessary evil

I just crash them with wool cleaning spray and crush it in a kleenex. My father can kill them from across the room with a rubberband, but I'm not Doc Holiday unlike him.