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> it does take about 30 seconds

As long as there's nobody in the queue, and the "scannette" (yes, that's how they're called) still has enough battery, and you haven't tried to buy razor-blades which require a manual action from an attendant to remove the theft-protection device, and the granny in front of you isn't trying to pay with coins.

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Never had a problem with battery or a queue that lasted more than a minute or so (either at Carrefour or Auchan, some of the largest ones in Lille).

The manual action doesn't take long because the attendant has little to do, and I don't use the lane where you can pay with cash, but the many others that only take a credit card.

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