All our resources are billed by the hour. However if the cost of hourly utilization of a resource exceeds the monthly rate, then we only bill you the monthly rate. The monthly rate allows you to run the resource for a maximum of 744 hours(31 days) but charged based on hourly rate for 480 hours(20 days). For example if you chose a 1 VCPU & 1 GB RAM orbit, the hourly price is 0.01$ and the monthly price is $4.50. If this orbit is running for 480 hours then the cost incurred is $4.80 but the monthly bill will reflect $4.50 which is the monthly rate for this orbit.
*This calculation does not count storage cost which is extra.