Ever since obtaining Naruto's template, Hawking had spent plenty of time chatting and communicating with the Nine-Tails.
His main goal was to get the Nine-Tails to lend him its power, and the condition he offered was that he could occasionally let it out for some fresh air.
What did the Nine-Tails want most?
Freedom, of course.
There was no way Naruto's side would let the Nine-Tails break free from its seal for a stroll. To keep the Nine-Tails from influencing Naruto again, Konoha had even assigned Yamato, who could use Wood Release, to stay by Naruto's side and help suppress the Nine-Tails' power.
But Hawking's situation was different. He promised that every so often, he would open the seal and let it out to move about freely for an hour.
After all, once the seal was opened, it would return to normal upon the second loading anyway.
Hawking had tested and confirmed this point as well. He had slightly torn open a bit of the seal and allowed some of the Nine-Tails' power to leak out.
When he loaded it a second time, however, the seal was completely intact again.
The Nine-Tails had participated throughout the experiment, so while inside Naruto, it constantly worked away at Naruto's seal, using its chakra to force it open bit by bit in hopes that it would someday gain freedom.
But once it came to Hawking, it simply gave up trying. There was no point in forcing it open anyway.
That was until Hawking discussed the matter of letting it out.
"Four months is too long, brat. I'm lending you all my power and fighting alongside you.
Three weeks. No less!"
"Kurama, you need to understand how many years you've been locked up.
It seems you only came out once when Naruto was born,