Runs for 4 km

Even as he realized his cries sounded rather strange, Kamijou Touma showed no sign of
stopping his tremendous flight.
As he ran through back alleys late at night, he glanced over his shoulder.
There were eight of them.
He ran frantically all over for almost two kilometers, but there were still eight of them.

- Volume 1 Prologue

After another two kilometers of sweaty and teary running, he exited the urban area and
came to a large river. A large metal bridge spanned the river, about 150 meters across,
and no cars could be seen on it. The sturdy iron bridge wasn't even lit up, just blanketed
by an eerie darkness reminiscent of the sea at night.
Kamijou glanced back as he darted across the bridge.
He then stopped: at some point, he had escaped all of his pursuers.

- Toaru Majutsu no Index Volume 1, Prologue