Driving time between Monaco and Venice?

I would have no reason to doubt them. It is about 600 km and at 100km/hr, that comes to 6 hours, no?

I don't think that you would be that fast. And that doesn't count any toilet or meal stops.

You might look at the discussion which took place on this topic in 2011, all the answers are still quite current.

It is at https://community.ricksteves.com/travel-forum/transportation/travel-between-venice-italy-and-monte-carlo-monaco

Thanks for the help.

It's less than 600km and all freeway. The drive is probably less than 6 hours, but you need to add the pit stops along the way.