No, it cannot. As has been said above, «demais»/«demasiadamente» = "too." :)

But in some sentences it does mean ‘too much’. Sometimes the correct answer for a sentence with ‘muito’ is given by Duolingo as ‘too’. So how do you know when it can mean ‘too [much]’ and when it doesn’t?

Because «comprido»/«longo» = "long;" «longe» never means "long"

The problem is that «longe» always means "far," never "long." If you want to say that the journey is "long," you would use the Portuguese word for "long," which would be «longa»/«comprida». Also, "long" and "far" are not the same thing. A journey is long, but the destination is far; it is never the other way around. "long" describes length, while "far" describes distance in comparison to an origin.