There is no exact days published on how long Danzo stayed as Hokage but sources suggest that he didnt stayed long as he was killed by Sasuke in a fight.
Naruto Shippuden is the second part of Naruto manga after Naruto Dattebayo. There are two and a half years gap between two parts.
Naruto Uzumaki is a loud, hyperactive, adolescent ninja who constantly searches for approval and recognition, as well as to become Hokage, who is acknowledged as the leader and strongest of all ninja in the village.
Check out 10 Mind-Blowing Naruto Facts You Don't Know, shared by OtakuKart.