public void setTimespan(long timespan) {
		Assert.isTrue(timespan >= 0, "Timespan must be a positive value");
		this.timespan = timespan;
	}
The timespan for aggregating write operations, before invoking the underlying {@link OffsetManager}.

@param timespan duration in milliseconds
extensions/spring-xd-extension-kafka/src/main/java/org/springframework/integration/x/kafka/WindowingOffsetManager.java