Masaki...I'm sure the differences in time for the Freedom Trail walk have to do with operating a group tour rather than two active individuals (like YOU and Amanda) doing it at your own pace. When you think of the logistics of gathering the group - doing transportation to starting point and then just keeping that number together and offering "rest stops" along the way, it quickly adds to the total time.
You will love walking in Boston - so much to do!You can definitely do it on your own.
