When I run e.g. this in online, it results in 12 minutes.
Doing the same via the Java API locally (using the most recent Belgium map), it results in 8 minutes; quite a big difference.
This is not an isolated case, comparing some routings with Google Maps shows sometimes big deviations.
I've found a topic Improved Feature: Better ETA values announcing from begin 2016 to improve the ETA.
Are my results expected? Can I influence this? Just multiplying with a factor doesn't seem right since the deviation is different case by case.