There is no stated size limit, but just in case I'd say it would be a volume of paper equal to the size of the user and maybe larger. Might want to confirm however, but since the wings upon her back are massive and bigger than Konan herself it should easily be a lot/large size.
These are the C-Ranks bound by Dance of the Shikigami:
(Kami Kasui no Jutsu) – Paper Stream Technique
Type: Offensive
Rank: C
Range: Mid-Long
Chakra cost: 15
Damage points: 30
Description: A technique only capable as to be utilized once Dance of the Shikigami has already been performed as well as once the wings have been formed on user's back. Taking advantage of paper sheets which are constructing the wings user would sent them forth creating a massive wave of paper planes towards their target as to pierce through their body. Taking advantage of the angle as well as side from which paper planes have been sent could make them hard to evade and can be used as a great distraction.
Note: To perform this technique user has to have both Dance of the Shikigami activated as well as wings already formed on their body.
(Kami Tsumujikaze no Jutsu) - Paper Whirlwind Technique
Type: Offensive
Rank: C
Range: Short - Mid
Chakra cost: 15
Damage points: 30
Description: A technique only capable as to be utilized once Dance of the Shikigami has already been performed as well as once the wings have been formed on user's back. By flapping their wings forth towards their target user would be capable of sending a wave of paper sheets which would as they are reaching intended target form a whirlwind with great cutting capabilities to it.
Note: To perform this technique user has to have both Dance of the Shikigami activated as well as wings already formed on their body.
( Hane Dageki no Funshutsu ) - Feather Gush Blow Technique
Type: Offensive
Rank: C
Range: Short-Long
Chakra cost: 15
Damage points: 30
Description: A technique only capable as to be utilized once Dance of the Shikigami has already been performed as well as once the wings have been formed on user's back. Manipulating paper sheets from the wings user would be capable of releasing multiple amount of them directly into their opponent which great power to them.
Note: To perform this technique user has to have both Dance of the Shikigami activated as well as wings already formed on their body.
( Hane Yajirushi Kasai ) - Feather Arrow Fire
Type: Offensive
Rank: C
Range: Short - Long
Chakra cost: 15
Damage points: 30
Description: A technique only capable as to be utilized once Dance of the Shikigami has already been performed as well as once the wings have been formed on user's back. Taking advantage of paper sheets from the wings, user would capable of releasing them forth in form of a needle like projectiles causing them to rain down upon their opponent.
Note: To perform this technique user has to have both Dance of the Shikigami activated as well as wings already formed on their body.
Understand these? Any questions?