Mieux vaut flotter sans grâce que couler en beauté.
On Long sea passages like this it is important to ensure that you are fully victualled, so that in the event of becalming or being blown off course you can survive for at least twice as long as the passage would normally take.
You do not mention how many crew, but I would hope that you have at least two on deck at any one time, with someone below monitoring the radar, radio, GPS and making little marks on a paper plan thingy every 10 minutes. These should change on a planned basis, every two or three or four hours- as an experienced skipper you will have to make the call. So you will need at least 6 crew. All of these should be Ocean Yachtmasters, with commercial endorsement.
As captain of this well found ship you should then be able to take to your bed for the entire trip, and awake refreshed as the boat berths in Cherbourg.
There is another way of doing it that involves a ferry.