To figure out how far a distance you traveled to get to my house, I need to know which path you took.

To figure out how long a time you traveled to get to my house, I need to know which path you took.

Our ordinary intuition is instead,

"To figure out how long a time you traveled to get to my house, I need to know the time on my clock when you left and the time on my clock when you arrived."

But that turns out to be wrong if you care about a high degree of precision or if you were traveling very fast.

Also because there is no meaning for the first value (there is no “synchronicity” between separate clocks).