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Aggravated Robbery is a class 3 felony:
It carries a presumptive sentence of 4-8 years in prison:
But because it is a violent crime, it has to be encahanced to at least the mid-point, 6 years. 6 years is the minimum, even for a first offender.
What the sentence will be is actually based on a whole variety of circumstances, including the specific preosecutor and judge.
That said, the fact that there were multiple offenses will aggravate the sentence. There may be mitigating circumstances too though. As a guide, 6-8 years is about average.
Because there is multiple offenses, they wouldn't just take the minimum and multiply it by the number, would they? Example 8 years X 7 robbery incidents = 56 years
Because they do not have the actual gun used (just a picture from the video cam taken during one of the robberies), they have deemed it aggravated instead of armed. But the perp was threatening or to use the legal term "menacing".
It depends how they charge him, but it is unlikely that all of the crimes would be sentenced consecutively.