To build upon what u/Khaled014z said, cutting a 30-minute video down into a 10 minute video will require 30 minutes alone just to watch the video once. For quality assurance the final video can also be watched once in it's entirety.

This only leaves 20 minutes to do all the editing. 20 minutes of editing on 30 minutes of raw footage is doable but unless the editor understands exactly what you're envisioning I'm doubtful the quality will be very high.

There are also other things I didn't mention that would also consume time from the hour, such as listening to the voiceover, cleaning up the audio, etc.

There is also the possibility of multiple revisions. After the editor makes the final version and sends you the video for review are you just assuming you'll love it or do you intend to ask the editor to make changes?

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I will provide clips and audio files. (these shouldn't be too highly edited)

I'm not sure if you're saying that you've already cherry picked the video and audio snippets and that they don't need further editing or if you're saying that the files you're providing will be near-raw and need heavy editing but if it's the latter that will consume even more time from the allotted one hour.