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Really, if you are non-technical, the only way you can know is if you have a technical friend you can run it by.
As others said above though, it doesn't really matter as you should be getting quotes to complete the task and a deadline for delivery.
The only time you should be paying per hour, is when the task is unknown, such as debugging server, database or code issues where it's impossible for the worker to predict how long it may take to resolve. In such cases, you should define a limit (say 5 hours) and at that point, ask him to let you know what he has found and you will authorize him to continue or not.
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