You can enable Cost Explorer for your account by opening Cost Explorer for the first time in the AWS Cost Management console. You can't enable Cost Explorer using the API. After you enable Cost Explorer, AWS prepares the data about your costs for the current month and the previous 12 months, and then calculates the forecast for the next 12 months. The current month's data is available for viewing in about 24 hours. The rest of your data takes a few days longer. Cost Explorer updates your cost data at least once every 24 hours.