The administration console Maximum lease interval property for indexing specifies a maximum for the following intervals: the wait interval for the dispatcher and the interval for a worker thread to process an index batch. The latter interval is called the lease interval.
For more information about these intervals, see Work and wait intervals for the subsystem dispatcher.
The default value is 14400 (seconds), which is 4 hours. The minimum acceptable value is 7200 (seconds), which is 2 hours.