You can work it out, a nautical mile being 2025.3 yards, a torpedo doing 46 knots, in an hour it would travel 93,163.8 yards, or 1552.73 yards per minute.
Once you know that, you can just keep the '1500 yards per minute' estimate in your head and do a rough calculation of time from that, i.e. an 800 yard run will be a little under thirty seconds etc.
A slower torpedo, ie. one travelling at 31 knots will cover 1046.25 yards in a minute, so again, a rough estimate of 1000 yards per minute is a close enough estimate for government work.
So fast speeds 1500 yards per minute, slow speeds, 1000 yards per minute, is a good approximate couple of figures to remember.
Of course some of the SH4 units of measurement are a bit screwed up at the moment and awaiting patching, but there you go.
Incidentally, you might find that the 'Microsoft Calculator Plus' which you can download from MS website will help you, in addition to calculating stuff, it can do conversions of all sorts of measurements, including nautical miles.
Good Hunting!
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