Quadski
A Gibbs Quadski (the thing Clarkson was riding in the Top Gear Lake Como special) could do it in about 18 minutes, though you would need to add a few minutes on to that to change out your wet clothing on arrival.
A Gibbs Quadski (the thing Clarkson was riding in the Top Gear Lake Como special) could do it in about 18 minutes, though you would need to add a few minutes on to that to change out your wet clothing on arrival.