# schedule(after:_:) Schedules `work` to run once after `duration` elapses, then returns immediately. ``` func schedule(after duration: Duration, _ work: @escaping @Sendable () -> Void) ``` ## Parameters `duration` How long to wait. Negative or zero durations fire on the next loop iteration. `work` Closure to invoke. Runs in the loop’s callback context. ## Discussion Wraps libevent’s `event_base_once(3)` with `EV_TIMEOUT`. The closure runs on whichever task next drives the loop (via [`run()`](/documentation/Event/EventLoop/run()) or any [`Socket`](/documentation/Event/Socket) / [`ServerSocket`](/documentation/Event/ServerSocket) operation that calls [`runOnce()`](/documentation/Event/EventLoop/runOnce()) internally). If nothing drives the loop before the deadline, the callback is queued but does not fire until something does. > SeeAlso: ``doc://Event/documentation/Event/EventLoop/sleep(for:)`` for an `async` shape that suspends the calling task.