Board Thread:Naruto Discussions/@comment-30323490-20180418150329/@comment-734582-20180418175157

Vladosaurus wrote: When i mentioned Kamui i was referring only to Kamui dimension, which Obito could easily go to at any given time. Obito can easily go to the Kamui dimension because it's his own pocket dimension, and so carries it with him. He still had to expend massive amounts of chakra to actually connect dimensions.

We don't know anything about Sasuke's hawk, including where it actually came from and where it resides. We do know however that Sasuke must have considerable reserves. So even if the cost of summoning were higher due to the distance, it's not inconceivable that he could simply pay that cost. Minato, Jiraiya and Naruto summoned giant toads with ease, and Sasuke summoned a giant snake with ease. Summoning a much smaller hawk at much greater distances is thus unlikely to cause a huge issue for Sasuke.