Number of days of the lease.
The SET operation to this object ought to be with
the SET of hh3cDhcpServer2PoolLeaseHour,
hh3cDhcpServer2PoolLeaseMinute,
hh3cDhcpServer2PoolLeaseSecond together,
and any SET operation alone to any of these objects
will be regarded as an invalid operation.
These objects cannot be set with 0 simultaneously.