I never have viewed long range as a set distance,it continually changes from one rifle to the next and is more about a comfort zone after zero and practice.LR for my 444 vs 264 are not even on the same page.
Perzackly!
So, I say, for the common gunnut, its => .5 seconds. Of course for the learned, the time can be expanded for their group. Also, bullet TOF includes environmentals and BC in its calculus for distance. The only further discriminator is target/group size. .5 seconds is not all THAT far. Here is some data from QuickLoad & QuickTarget with high desert environmentals:
~.5 seconds vs distance
5.56 mm NATO - 5.56 x 45 mm
Bullet : .224, 69, Nosler HPBT 17101
Bullet weight : 69 grains, MV 2870 fps, 380 yds
5.56 mm NATO - 5.56 x 45 mm
Bullet : .224, 80, Nosler HPBT 25116
Bullet weight : 80 grains, MV 2680, 380 yds
308 Win.
Bullet : .308, 168, Nosler BalTip
Bullet weight : 168 grains, MV 2820, 410 yds
308 Win.
Bullet : .308, 180, Nosler BalTip 30180
Bullet weight : 180 grains, MV 2650, 390 yds
30-06 Spring. (SAAMI)
Bullet : .308, 168, Nosler BalTip
Bullet weight : 168 grains, MV 2860, 410 yds
22-250 Rem. (SAAMI)
Bullet : .224, 60, Nosler BalTip 34992
Bullet weight : 60 grains, MV 3600, 450 yds
9 mm Luger (SAAMI)
Bullet : .355, 115, Nosler JHP 44848
Bullet weight : 115 grains, MV 1120, 160 yds
45 Auto (ACP) (SAAMI)
Bullet : .451, 230, Nosler FMJ 42064
Bullet weight : 230 grains, MV 850, 135 yds
357 Magnum (SAAMI)
Bullet : .357, 158, Nosler JHP 44841
Bullet weight : 158 grains, MV 1366 fps, 190 yds
22 LR
Bullet : 22 LR high vel 40g
Bullet weight : 40 grains, MV 1260 fps, 175 yds
22 LR
Bullet : 22 LR subsonic 40g
Bullet weight : 40 grains, MV 1080, 155 yds