Show the time at milestones for a car travel route

When I enter a car route in Google Maps (e.g. Amsterdam to Madrid) I get nicely a total in estimated hours and the distances between each milestone.

But I'm looking for the time at each milestone. (because in that way I can mark spots where I can rest each 2 hours)

So e.g.:

1. milestone 1 : 3.7 hours
2. milestone 2 : 4.3 hours

etc... Is there a tool / method / plugin / anything to achieve this easily?