That's an 80 odd mile trip. Speaking as someone that takes an 21' 4.3l 195hp mercruiser all over the place, it's doable, given a very good settled weather forecast and light to moderate sea conditions.

However, the fact that you are asking the question suggests you may not really be experienced enough to undertake that sort of trip, as it could turn out to be quite 'exciting' if the sea conditions worsen while you are a long way out to sea with no nearby save havens to bolt to.

You'd also want to be fully equipped with offshore flares and possibly a hired life raft. At that distance, fuel also becomes an issue - not for a good trip across, but in case you have to slow down, in which case fuel consumption rises, and you will need to consider how to carry plenty of contingency, and how to refuel while out at sea.

PS this sort of question better posted in the Motor Boat Chat forum. This particular forum is for a planned cross channel cruise to France using non electronic navigation

Catapultam habeo. Nisi pecuniam omnem mihi dabris, ad caput tuum saxum immane mittam.