You will need to plan 2-3hrs on this one. So much information and detail here, but not just reading through info...much of it is interactive. You can be involved in a line-up, sit in court, "hunt" for bad guys, sit in the electric chair, shoot the Tommy Gun and more. Bring your visitors to this museum to learn a little history. When we went you purchased a day bracelet so you can leave for lunch and return if needed, pretty sure you can still do this.
Good package is to get the bundle tickets to include the Mob Museum and Neon Museum (Boneyard). You can attend one, and another day attend the other (within a couple days of each other)