Interval Slack is the number of days you are willing to wait before you receive your data. In some cases, satellite providers have lead times of several days before they are able to provide data. With longer interval slack, you will have more sources available to you. With a shorter interval slack, you will receive your data faster, but we may not have as many options to give you the best possible result based on your parameters.
For example, if you need data every 4 days and require your data within two days of the end of each interval, you would set your interval to 4 and your interval slack to 2. When no interval slack is specified, we default to 3 days, which allows us enough time to receive virtually all available imagery data.