On his way to Burlington, how far did Franklin have to walk? What can we infer about Franklin based on this fact?

Franklin traveled fifty miles, and from this, we can infer that he was determined, especially because he wasn't feeling well.

In the evening I found myself very feverish, and went in to bed; but, having read somewhere that cold water drank plentifully was good for a fever, I follow'd the prescription, sweat plentiful most of the night, my fever left me, and in the morning, crossing the ferry, I proceeded on my journey on foot, having fifty miles to Burlington, where I was told I should find boats that would carry me the rest of the way to Philadelphia.