Aggravated Robbery is a pretty serious crime and you'll almost certainly be sent to prison for at least 5 years for the aggravated robbery.
But in some states the aggravated robbery can get you from 15 to 25 years in prison especially if you threatened someone with a deadly weapon in the commission of the aggravated robbery.
Most people who do aggravated robbery barely get off with more than $300.00 to $4,000.00 but you'll certainly be spending some time in prison over the robbery.