Ecka-hour Ec2 is calculated hour by hour. If you are just starting and closing an instance, it still counts as one hour.
How does Heroku deal with this? Per minute or per hour?
Suppose my application usage exceeds 750 Free Limit Hour Limit
Geroku prorata to the second. Dina costs $ 0.05 an hour. So if you drive more than 750 hours, you will pay $ 0.05 per hour or $ 0.000833333 per minute. In fact, almost all add-ons also follow the same payment model.
https://devcenter.heroku.com/articles/usage-and-billing#cost
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