The one thing missing from the analysis is the number of torps fired and the number that hit prior to sinking. Most attacks used more than one torpedo where available to be sure of a sinking so without that crucial data the comparison is relatively meaningless other than to say that if you get at least one hit you can expect that most of the time the ship will sink within about 20-30 mins. This is certainly my experience and I practise the rule that anything worth shooting is worth shooting twice.
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