Well, as everybody else said, for some not even 10,000 would be sufficient. So many variables.
But FWIW some excellent friends of mine lived aboard 7 years and spent two of them sailing across the
South Pacific on a
boat purchased for 5000 dollars. They had essentially no savings and no
income other than what they made by doing manual labour, mainly on other boats, along the way, and sometimes bar singing etc. He is a very good musician. Totally hand to mouth. They repaired everything, salvaged and sourced what they could from many unlikely places, lived entirely on the hook, and were very happy. I would consider both good and careful sailors, even having a parachute
anchor aboard, which they did deploy on several occasions. This was an old airdrop chute they got for next to nothing. Yes they were young (still are!) and were both very resourceful and willing to put up with basic living (saltwater bathing only for example, and eating mainly self caught fish).
I also know at least three other similar, one who is in his sixties and works three months a year as a vet, sailing the rest of the time on his flat bottomed Dory wooden junk rigged schooner. He has no
engine, even on his
dinghy, and propels the 34 foot dory even uprivers (such as Kotakinabalu) with the use of a sculling oar. I watched him take nearly 2 hours to tack into an anchorage at Vava'u,
Tonga, once, which would have taken 10 minutes with an
engine. He navigates entirely by
sextant, has a couple of
electric lights and a handheld
radio, switched off unless needed, and one
single battery. Most
lighting is
oil. He makes his own wine, has circumnavigated twice or so, including some fairly high latitudes, and is very happy, and very charming.
Likewise a third
boat I met in
Antigua a few years back, a lovely 1935
wood gaff rigger, around 32 feet. A couple in their thirties who had lived aboard 8 years or so when I met them 5 years ago. Beautiful pastel washed boat he had rebuilt as was a
wood boatbuilder. He plied his
trade around the world and she taught yoga. Likewise no
electronics or electrics, aside from nav lights, and
oil lamps only. They had two lovely
children, around 5 and two at the time. Very happy, and had sailed from
West Coast Canada to
Madagascar and back.
Likewise a
family who used to sail aboard the "Black Pig" a 60 foot homebuilt
steel double end schooner I would term "unique", which I was aboard in Inverness,
Scotland. The vessel was put together by the Husband/Father, who was a professional welder. Fore and aft
cabin one at each end. Industrial refinery piping as masts. Most of the centre of the
hull was an open hold. They lived aboard for more than a decade along the coasts of
Africa and
South America, he plying his welding
trade, and them using the vessel as a coastal trading vessel, carrying goods in its hold! Amazing! They had 4
kids, most of whom were born aboard, and their two heads consisted of actual, bona fide heads, holes cut into the long overhangs fore and aft, well above
deck level!
And NONE of them has a blog. Which is why you have likely never heard of them, unless fortunate enough to have crossed wakes. (Not everybody needs the world to know and follow every detail of their lives, and many of the most remarkable sailors I have ever met live and sail in obscurity. My kind of people, really.)
Just a few I have met "out there".