Board Thread:Versus Debates/@comment-26958911-20151010214426/@comment-25093611-20160104192750

Ninja Of War wrote: The speed of sound is 343 meters per second, that means in 1 second, the range of exposure is 343 meters for a sound based jutsu, which in this case is a genjutsu. Now I know this is Naruto and not the real world but, since there is gravity and other physics concepts present, the speed of sound in air is assumed to also be this in Naruto.

Therefore, if the genjutsu is completed there is no escape for Itachi. The toads were not exhausted after the genjutsu, but I do agree that they will not be able to spam this genjutsu. Since Itachi will most likely be in his Susanoo when this genjutsu is cast and his Susanoo is not as mobile as he is plus he is susceptible to genjutsu in his Susanoo it's Jiraiya's win, no need to spam.

P.S. the toads use senjutsu, which implies that they each have extreme reserves of chakra in the first place, meaning at the very least, Itachi will run out of chakra before they do. i also think that speed of sound would be the same but "sound" isnt what this jutsu can do, as example: raikage uses lightning-armor, according to laws of physics this should be possible... dont gt me wrong, i dont want to put this into a "if jutsus happened in RL", what i try to say is that a jutsu is bound to the amount of chakra used to support it, even if sound travels that fast it doesnt mean that a single shout can trap a enemy (exspecially since the length in which a jutsu needs to travel before becoming active heavily increases the chakra consumption ^_^ ), plus, there are jutsu-specific rules, as example: sharingan-genjutsu only works via eye-contact or rasengan requires chakra to spin around or fire-jutsus are created via concentrating chakra in the lungs and than shooting them out,

in short: we cant be sure that the sound-genjutsu, even if it is a senjutsu-technique, would actually work in a larger range without a LOT more chakra-consumption :)

but i agree, if itachi is in susanoo jiraya actually doesnt need to use genjutsu, he could simply wait for itachi to run out and to ensure that susanoo is used he simply needs to attack with large sclae attack which he can use infinitely since the frogs allow him to be in sage mode without timelimit ^_^