If you see the time out message, click on the share button and post the link here .
Usually there should be a different error message, that’s why I am wondering. You can try to place a waypoint somewhere in the middle, this usually helps if there is an issue for long distance routes (>1000km).
Thanks for the update. You can also solve this by placing the start west of New York, instead of east. The issue is most probably that Kurviger tries to avoid driving through the greater New York area, but there is no real alternative, since you started on an island. Extra curvy tries to avoid driving through cities areas as much as possible, so Kurviger tries to find a different way and at some point you will hit the timeout.
Robin your explanation makes sense, but I think the key point here is:
This needs a better error message. Maybe something like
This calculation seems to take very long. This may be an API error, but you could also try resolving this by adding some waypoints or setting a different route profile to make life easier for our software. If this message keeps appearing regardless, please let us know in the forum
Which would cover both cases, a repairable and a non-repairable scenario