It is a voyage of 50-odd miles, four rivers and, crucially, seven bridges.
But the crew of sailing dinghy Snark was able to complete the non-stop trip from Beccles to Barton Broad in just 13 hours.
The trek was undertaken by Mark Elson with Rosie Pank, 15, and Ellie Thwaites, 14.
It was organised by Norwich School, where both girls are pupils and where Mr Elson is a sailing coach.
The voyage was dubbed the Great Punt Run, as Snark is a Norfolk Punt, and raised money for the Nancy Oldfield Trust (NOT), a charity which offers boating opportunities for the disabled and disadvantaged and is based near Barton Broad.
The crew set off from Beccles at around 7am, on June 15, and headed down the Waveney, with a RIB (rigid inflatable boat) in support.
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The teenagers took turns to sail with Mr Elson, with the other in the motor boat, accompanied by Emily Greves and Lester Wellerd from the NOT.
Humphrey Bedford-Payne, a Norwich School teacher, followed the route by car, providing further support and encouragement.
The first bridge Snark reached - the railway crossing at Somerleyton - opened automatically, so the crew did not need to take their mast down until St Olaves.
In a brisk breeze, they then sailed across a choppy Breydon Water - where the Waveney joins the Yare.
They lowered the mast before the bridge on Breydon and passed under the crossings in Great Yarmouth before heading up the Bure.
The mast had to come down twice more, at Acle Bridge, and Ludham Bridge, on the river Ant.
The team reached Barton Broad - the spiritual home of the punt and home waters of the NOT - at around 8am.
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Stephen Bradnock, from the Nancy Oldfield Trust, said: "We are delighted to be the beneficiary of the proceeds of the Great Punt Run.
"Many thanks to Ellie Thwaites, Rosie Pank, and Mark Elson for undertaking such an epic challenge, and to Humphrey-Bedford Payne of Norwich School for organising the event.
"A challenge of this size is no mean feat, the team’s dedication to this task is hugely appreciated. We also thank Lester Wellerd for lending his RIB and providing safety boat cover for the duration of the journey."
The Great Punt Run was held once before, in 2019.
The pandemic then intervened, but Norwich School and the Nancy Oldfield Trust hope it may become a regular event.
It has already raised more than £1,000 for the Nancy Oldfield Trust, which relies on donations, and the organisers hope that total will still rise, with their Justgiving page still open.
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NORFOLK PUNT
These boats have been described as the 'Ferraris of the Broads', as they are the fastest, most powerful and exciting class of dinghy found on the waterways.
But they have a far more sedate heritage.
They are derived from traditional flat-bottomed vessels, with long guns mounted on them, which roamed the Broads in the 19th century for waterfowl hunting.
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At the turn of the 20th century, punters started to add basic masts and sails to the craft to get to and from their hunting grounds.
Gradually, the sailing dinghy developed.
The designs have changed over the years, with more than 100 built.
They are mostly sailed on Barton Broad, home of the Norfolk Punt Club.
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