Ben Edgington 934c037a8a
Correct the duration of HISTORICAL_ROOTS_LIMIT
The duration of HISTORICAL_ROOTS_LIMIT is:
    SECONDS_PER_SLOT * SLOTS_PER_HISTORICAL_ROOT * HISTORICAL_ROOTS_LIMIT
which is
    12s * 2^13 * 2^24 = 1.65e12s = 52,262 years
2020-02-22 09:22:52 -06:00
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