Queues can be configured with a dispatch window, which specifies one or more time periods during which jobs are accepted. Hosts can be configured with a dispatch window, which specifies one or more time periods during which jobs are allowed to start.
Once a dispatch window is configured, LSF cannot dispatch jobs outside of the window. By default, no dispatch windows are configured (the windows are always open).
Dispatch windows have no effect on jobs that have already been dispatched to the execution host; jobs are allowed to run outside the dispatch windows, as long as the queue run window is open.