1/20th of 1 Second [from 4Chan]
(media.greatawakening.win)
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A TYPICAL AR-15 round (55 grain FMJ like NATO M193) out of a TYPICAL length AR-15 (16" barrel) will not be traveling 1006 m/s, or 3300.525 ft/s. It will be closer to 3100 ft/s, perhaps as low as 3000 ft/s depending on manufacturer and location conditions. Even out of a 20" barrel 1006 m/s exceeds design specs of M193.
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Atmospherics indicate that it was also quite humid (vapour trail of bullet) so that would also slow the bullet slighty, yes?
No, the opposite actually, but humidity has the least impact of the environmental factors. Humid air has less density than dry air and thus exerts slightly less drag on the bullet.
humid air is apparently less dense than dry air, at least that is why I have heard is the reason homeruns are easier to hit when it is warm and humid, but perhaps it is just the air density vs temperature, with cooler air being more dense, regardless of humidity.