My drag estimate was based on Sturgeon-class SSN for size, power and speed. I would expect the Sturgeon-class to have a lower drag coefficient than the LA, because it has a lower length-to-beam ratio.
Max acceleration, of course, would mean cavitating at shallow depths. If you limit prop speed to below the cavitation threshold, acceleration to flank speed will take longer, of course. Somewhere I have notes on that and I even wrote a program. I no longer have the latter, but I seem to recall acceleration to flank from a dead stop took around 60 seconds without cavitating.
Sounds like we're both in the same ballpark.
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