travelTimeUpTo
Calculates the travel time up to a given distance along the route.
This function returns the travel time from the start of the route up to routeOffset.
Return
A Result containing the travel time up to routeOffset as a Duration, or a RouteDataFailure instance if an error occurred.
Parameters
routeOffset
The distance from the route's start, marking the point up to which the travel time is to be calculated.