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The MRTG default interval is five minutes, but you can reduce that to whatever you like, just as long as the reply comes back in less than that.
While the default graph is for one day, mrtg also generates graphs per week, per month, and per year. I use cacti as a front-end, and I can zoom on the graphs so that I see the individual 5-minute data points almost a year ago.
You'll have a hard time finding a tool that is *not* based on MRTG.
HTH
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