Fix NTA-related races
Changes introduced by commit 6b8e4d6e were incomplete as not all time-sensitive checks were updated to match revised "nta-lifetime" and "nta-recheck" values. Prevent rare false positives by updating all NTA-related checks so that they work reliably with "nta-lifetime 12s;" and "nta-recheck 9s;". Update comments as well to prevent confusion.
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