First off when i said long i dod not mean painstakingly long ... Second It did not take "Seconds" to create the sand ... From the moment he got on the ground he was funneling sand into the terrain .. and then a few events passed by before he unleashed it .. But Effort=/= Time .. Just because he said verry little effort does not mean it wont take a little while .. I dont think i need to provide an example. With the time it does take it would be very easy for Kakuzu to fire off Raiton Gian
When i said long i meant in a battle comparison nor did i ever say he would be blitzed ,, until now lol ..
And id like to point out that the reason Raiton is so effective on the Sand is actually because it is hot enough for the sand to begin to melt, softning it up for the intense piercing that usually comes with raiton .. So if someone knew this information ... which no doubt Kakuzu does being the intelligent man he is, if he were to double the lightning bolts fired off by gian .. Causing even MORE heat to radiate from the lightning and penetrate the sand faster and causing greater damage to the sand ..
so basically it would not matter how much sand he uses to reinforce .. Kakuzu can simply fire off more lightning strikes upping the heat a.k.a ripping through the sand regardless.. Just a little thing i thought up
Unless my science is dead wrong but im pretty sure its not this time