Idle time while loaded constraint

[odashevsky]

Hello. We are solving a VRP problem and have encountered a requirement where a vehicle cannot idle while waiting for next location's window to open if it already carrying cargo. This means, currently solver finds a solution where a vehicle picks up a load from location A (within A's open window) and travels to B and sits there and waits for B to open (B has its own open window). Our restriction is that if vehicle has load onboard, it cannot sit idling for more than 10 minute, but the vehicle can wait indefinitely if vehicle is empty.
I think I need to use a conditional restriction and I know how to do a condition if the load is empty or not. I just not sure how to code the "idling at the location waiting for it to open no more than 10 minutes" part.
Any insight is appreciated. Thank you.

[Mizux]

I would try:

solver = routing.solver()
for index in range(routing.Size()): # all indices except end.
  cond = solver.BoolVar(f'{index} is not empty')
  solver.Add(cond == (load_dimension.CumulVar(index) != 0))
  solver.Add(time_dimension.SlackVar(index) * cond <= 10min * cond)

[odashevsky]

Thanks, this gives me enough to work with. As always, I appreciate you help, Mizux.