it's top speed is 7 knots ish with a 600 gallon fuel capacity using approx 2 gallon per hour.
I'm not sure I believe the numbers. Gallons I suppose could be correct as it's objective. Consumption
seems quite low unless we are talking flat calm water
. I can't see it doing 7 knots at 2 gallons in any kind of weather
. Unless you could sustain good speed in heavy weather
it could be a nightmare. Powered boats when under powered are very unstable. The nature of the boat and engine
would make a difference. Fishing
trawlers are not normally thought of as ocean passage
making boats. Most long distance fishing boats would be larger.
how much and how long would it take and is it even possible ?
Being possible is not really a good way to look at it. If were possible that would leave "slightly not possible". I would more apt to be thinking in terms of if it would be fun. Or more exactly how to make it maximum fun. Just doing it won't set any records and could be sort of a bad time were only just slightly more than possible. Being impossible would of course settle any questions of being fun. Your skills as a captain
may be more the question that hangs in the balance.
You might be better apt to make some shorter goals to settle it all out before taking on such a huge plan.
As for pirates, I would not worry as they should be able to catch you handily. They won't think you are attempting to out run them. The key is not being where they are. That is more a navigation
issue than anything else. Times and situations shift so it's more an issue should you actually get that close. I would delay the matter for now given you may not get that far or choose to travel in other directions.
As for time required I would personally attempt to take as long as humanly possible. 10 years would be a good working goal. It helps to avoid the more difficult question of just what will you do if you actually get there? I think spending 10 years to do it would be better preparation. Were you to focus on making the shortest possible legs with extended stays you may find after 5 years it really does not matter since the journey becomes more important than completion.