the angle tighten figure is given on the packet with the sparkplugs normally but this is for an uncrushed crush washer, if you remove and refit you dont do the angle...just "nip"
mostly it's also specified on the spark plug box, usualy it says something like this: hand tight and then about 1/2 turn, otherwise 20 nm would be fine.
I do know that a lot people tighten them to much. It is only to squish te seal ring of the sparkt plug, not to demolisch it
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