maximumBatchingWindowInSeconds

The maximum amount of time to gather records before invoking the function, in seconds (between 0 and 300). Records will continue to buffer (or accumulate in the case of an SQS queue event source) until either maximum_batching_window_in_seconds expires or batch_size has been met. For streaming event sources, defaults to as soon as records are available in the stream. If the batch it reads from the stream/queue only has one record in it, Lambda only sends one record to the function. Only available for stream sources (DynamoDB and Kinesis) and SQS standard queues.