The problem is thinking of time as a unidimensional directed flow that we are pushed along by, rather than a multidimensional manifold that we traverse.
Think of even a flat graph. If two agents start at (0,0) and both travel to when x=4, the agent that went from (0, 0) to (4, 0) had a trip of length 4. The agent that went from (0, 0) to (4, 3) had a trip of length 5.
The problem is thinking of time as a unidimensional directed flow that we are pushed along by, rather than a multidimensional manifold that we traverse.
Think of even a flat graph. If two agents start at (0,0) and both travel to when x=4, the agent that went from (0, 0) to (4, 0) had a trip of length 4. The agent that went from (0, 0) to (4, 3) had a trip of length 5.