Re: Glossing a commercial turd
Don't bother doing it that way - get the 3 hour afternoon fast ferry to cherbourg and drive to St Malo which is about another hour or 2 depending on traffic.
But if you did that in the evening, you'd need to find somewhere to sleep at the destination and that will be another 8 hours or so.
Might as well use the boat as the hotel and sleep through the journey.
