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I'm slightly confused since there is already a TOP XX protocols chart. Granted no pie chart for it but it shows what I think you want. Also make sure you time out active flows at least every minute at the router. There are some articles that explain how NTA rolls up data. Re: Question on netflow compression settings
If you use the NTA chart I mentioned and timeout flows as mentioned then you should see 1 minute granularity over 15 minutes. From within this chart you can drill down further.
And an example of me drilling down into TCP