If You Had A Twin, But Didn't Realise...
Family Life20 mins ago
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For more on marking an answer as the "Best Answer", please visit our FAQ.This is just a guide as the time depends on your particular oven and every one is different. The cooking will be a lot simpler if you can find 20 potatoes roughly the same size.
Pre-heat oven to 200c or Gas 6 - prick spuds all over as this will cut down the time. Cook for an hour, then test largest spud with skewer or sharp knife - if it feels soft right through then they are done - if a bit hard cook for another 10 minutes before testing again.