Hi,
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Please confirm where do you see the duration ?
Are you using Wired or Wireless connection ?
Are you having Metered connection ?
When you say does it 'reset' itself after 'X' number of hours/days or after a specific maintenance eventwhat do you actually mean ?
Please share the screenshot the issue with us for the better understanding of the issue.
Pleas get back to us with the required information and we will be glad to help you.