B&B Electronics SPECTRE Configuration Manual page 46

B&B Electronics, Inc.
The random time, after which it will exchange new keys, is defined as follows:
Lifetime - (Rekey margin + random value in range (from 0 to Rekey margin * Rekey Fuzz/100))
By default, the time for the exchange of keys is between:

Minimum time:

Maximum time:
In most cases, the settings should be left at their default values.
1h - (9m + 9m) = 42m
1h - (9m + 0m) = 51m
Fig. 34: IPsec tunnel configuration
46
SPECTRE Configuration Manual
710-10001-02 Rev. 3.0
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