In one of the new Bleach novels, We Do knot Always Love You, two characters took several days traveling from one of Seireitei's gate's entrance to a barrack in Seireitei (the 7th Division barrack). They describe traversing mountainous terrain and forest as well over the course of several days. Here is the quote:
“Uncle gave us cloth to hide our faces, so we wore that and walked through Rukongai for several days……we were then concealed inside a wooden box and loaded onto a cart before a huge gate.”
"To start with, we thought we should meet Tetsu san, we asked uncle about the location of the 7th division. In order to not be discovered by people, we only traveled at night time, we passed through mountainous terrain and forests……on the night of the third day, in the middle of the forest we detected the scent of a fellow wolf……!”
So they walked for several days in the Rukongai until they arrived at one of Seireitei's gates, they entered Seireitei, and from there it took them three nights of traveling until they arrived at the 7th squad barrack.
Even if you say that they walked each night for 5 hours at the average walking speed (5 km/h), that's still 75 kilometers.
Also, the novels are canon. Kubo is a co-writer and the novels develop multiple characters and resolve a lot of the unresolved plot threads from the manga.
So, what do you guys thinks of this?