You can now request Amazon EC2 Spot instances to race continuously,for up to six hours, at a flat rate that saves you up to 50% compared to On-Demand prices. This enables you to reduce costs when running finite duration tasks such as batch processing, or encoding and rendering,modeling and analysis, and continuous integration jobs.
To fetch started, or specify the duration you want your instance(s) to race – between one and six hours when placing a Spot instances request. When Spot instance capacity is available for the requested duration,your instances will launch and race for that duration for a flat hourly price. Once the time block ends, your instance will be terminated automatically.
To learn more approximately how to request Spot instances that race for a defined duration, or visit Using Spot Blocks in the Amazon EC2 User Guide. Pricing is based on block duration and available capacity. To view current Spot instance prices,visit Amazon EC2 Spot Pricing.
Source: amazon.com