Amazon charges EC2 instances for uptime, not processor time. The cheapest type of Linux instance is 8.5c / hour, or around $ 37 a month. You can reduce this by signing up for a reserved copy that you plan to run for a long period, or by using spot prices at the price of the copy , where you bid what you are willing to pay.
You will also receive a fee for transferring data to and from the EC2 network, as well as storage costs if you permanently store data on AWS. They should be small compared to the cost of starting an instance.
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