increase duration between downloads on Pluralsight

[pythonoma]

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• You will be asked some questions and requested to provide some information, please read them carefully and answer honestly
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Make sure you are using the latest version: run youtube-dl --version and ensure your version is 2016.12.01. If it's not read this FAQ entry and update. Issues with outdated version will be rejected.

• [x ] I've verified and I assure that I'm running youtube-dl 2016.12.01

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• [ x] At least skimmed through README and most notably FAQ and BUGS sections
• [x ] Searched the bugtracker for similar issues including closed ones

What is the purpose of your issue?

• [ x] Bug report (encountered problems with youtube-dl)
• [x ] Site support request (request for adding support for a new site)
• [ x] Feature request (request for a new functionality)
• Question
• [ x] Other

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Description of your issue, suggested solution and other information

I received this message from Pluralsight
We have blocked your account because our security systems have flagged your Pluralsight account for an unusual amount activity. This does mean a high volume of requests that are in the realm of a request every 10-30 seconds for a prolonged period of time. Please note that this high volume of activity is in violation of our terms of service [https://www.pluralsight.com/terms].

If you're not aware of anything that could cause this high amount of activity, it's possible that your account may be compromised and you might want to consider changing your password. We will unblock your account when you acknowledge our terms of use by replying to this email and please let us know if you have any questions.

Kamron A.
Customer Service
Pluralsight

---Solution:
Increase duration between downloads > 30 seconds

[pythonoma]

we need to pass arguments of min & max duration here
https://github.com/rg3/youtube-dl/blob/master/youtube_dl/extractor/pluralsight.py#L254

[yan12125]

You can specify --min-sleep-interval and --max-sleep-interval values to avoid account banning. There are some suggesstions in #6090