Planning
How Long Does It Take to Walk the Freedom Trail?
Realistic timings for a quick walk, the classic experience and a full day.

The short answer
Walking the 2.5 miles nonstop takes about an hour. But almost nobody does that — plan 2–4 hours to actually see the sites.
What adds time
Going inside museums, a North End lunch, lines at the USS Constitution, and climbing Bunker Hill Monument can each add 30–60 minutes.