SetCumulVarSoftLowerBound for route duration

[KaramallahG]

It seemed that one can set a soft constraint on the start and the end of the route using SetCumulVarSoftLowerBound

index= routing.End(1)
time_dimension.SetCumulVarSoftLowerBound(index,60*60, 5)

Instead of limiting the beginning and the end, I want to make it more flexible by limiting the duration (end-start)
something like

index = routing (End(1) - Start(1))
time_dimension.SetCumulVarSoftLowerBound(index,60*60, 5)

is there such a method that can do that?
Many Thanks

[lperron]

Actually not, there is a soft span upper bound in C++.
Nothing for the lower bound.

[Mizux]

Why not using a "duration" dimension instead of a "time" dimension and make it start a zero so you can use SetCumulVarSoftLowerBound() on end node....