In case the report definitions don't change on day by day basis, you'll be fine creating a definition once for all of your individual accounts. You'll only get charged for report creation and not for the daily downloads, so unit costs shouldn't be an issue. The downloads themself are very fast. Downloading all your reports using multiple threads will only take seconds up to a couple of minutes depending on the number of threads used and internet connectivity. I wouldn't suggest to work with more than 4-6 parallel downloads though, as Google may decide to block you when you push it too far (but thats also just hearsay, never experienced any throttling here).
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