Originally Posted by andreworiordan
It is approx 900nm around, at 20kts it works out as roughly 45hrs, allowing for sea conditions and refueling id say 70hrs, That was one idea, the other is to break it into two legs at 24-30hrs a leg
In my experience with 2 people, the fuel, gear etc you will want on boat 20 knots will be very close to max speed with a 20HP engine. Thats only tolerable in a flat calm (otherwise you are slamming into every wave). 15-16 is a sustainable cruising speed upto about F4 / 2ft-ish waves. 10-12 is more likely beyond that (and it will be wet and tiring).
With say 2 fuel tanks you will probably have a range of about 8-10 hours. Just meeting up with someone and refilling those tanks will take at least 1/2 an hour each time. Probably more likely an hour allowing for cock ups with where they meet you and cathcing up on weather or other info they might have for you plus fixing any bits needing fixed on the boat.
So assuming you could manage virtually non stop (no rest) it would be 60 hours moving, with approx 7 hours for fuel stops. You'll need to eat and drink too and while you can do it on the move - its not going to be fun doing that for 3 days.
So even without sleep I think you will be pushing it to do the trip in 70 hours. And I think sleep will be essential (and unless its flat calm you won't get any on board). Doing it in a week in that size boat would be impressive, more feasible, more sensible but still a serious challenge.