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This assumes there is no margin of error baked into the 51 day rule, which surprises me.

This communication is not Boeing communicating a required maintenance interval, they're communicating a problem. It wouldn't seem natural for me for Boeing to add a random hidden margin in a problem description. When it comes to the maintenance remedy, I don't know if Boeing would do this or airlines or the FAA. Presumably the mandatory maintenance reboot interval will be much shorter than 51 days.

2^47/(32MHz) ~= 50.9 days

Not much of a margin there.

2^47/33e6 = 49.36 days. The value is so much off that makes me suspect that this is not the correct analysis, or at least that there are additional factors at play

exactly. you could find a plausible clock rate that rolls over in ~51 days with any number of assumed counter widths. this is not indicative of anything but guessing.

and there is no margin at all or negative margin, so clearly this is wrong. is the rollover period 52 days? 60? 90?

the whole article is a bunch of unsubstantiated speculation dressed up with lots of facts and details to distract ones attention.

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