22.1 kilometers.

1. First, walk 41m from Luorong Town to Luorong People's Hospital Station.

2. Then take the Express Line 1 at Luorong People's Hospital Station and arrive at the People's Hospital Station after 2 stops.

3. Finally, walk 1.1 kilometers at the Municipal People's Hospital Station to reach the finish line, totaling 22.1 kilometers, which takes 1 hour and 22 minutes.