How long do you need at the Château des ducs de Bretagne?

Thirty minutes: the free circuit

Through the gate, across the courtyard, up onto the wall, round the 500 metres of curtain wall past the seven towers, back down and out through the moat gardens. Half an hour at a normal pace, a little more if you stop at each tower to work out which is which. This is the version I recommend to people changing trains, and it costs nothing, as what’s free sets out.

Ninety minutes to two hours: the museum

The Musée d’histoire de Nantes runs to 32 rooms and seven sequences, with around 1,150 objects and a lot of interactive multimedia. Ninety minutes is enough to walk it without rushing; two hours if you read the panels in the slave-trade section properly, which is the part most people slow down in. Remember the ticket desk closes 30 minutes before the museum, so a 5pm arrival gives you an hour, not two.

Half a day: castle plus old town

The castle sits at the edge of the medieval centre, so most people fold it into a wider walk: the Porte Saint-Pierre gate beside the cathedral, Place du Bouffay, Feydeau, Place Royale, the Passage Pommeraye. That is a half day at a walking pace. A guided version compresses it: the French-language old-town walk runs two to two and a half hours and covers roughly a thousand years, and the private walking tour is two hours on a route you choose. Both are compared on guided tours, and all five versions of the visit are set out on the ways to visit page.

If you only have one day in Nantes

The fastest way to cover ground is the e-bike tour: two and a half hours along the 22 km green line, stopping at the château for Anne de Bretagne’s story, the mechanical Elephant and the Machines de l’île, and the LU Tower. It rates 4.8 from 34 reviews, and Heidi from the United States put the case plainly: “The electric bikes made it possible for us to see much more in a short time without working too hard.” Details and the height rules are on bike tours.

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