what does cloud hosting "monthly hours of service" mean?

Cloud hosting providers often calculate the cost by hours. When I try to register on RackSpace.Com: http://www.rackspace.com/cloud/cloud_hosting_products/servers/pricing, there's a field to estimate the monthly cost by average server time. What does this mean? Does it mean if nobody visits my website for an hour, there'll be no cost at all? So the real cost will be much lower, if the website is not yet popular, right?

Thanks

Solution

It is usually means uptime not visited time.

So if it is up all month that is approximately 750 hours of usage.

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