What price would you pay for a Wendi conviction?

Let's say Charlie is ready to roll on Wendi for the right inducement. What would you see fit to offer him?

If there was a mastermind of the murder, it was Charlie. He conceived it, joked about hiring hitmen to various people, sought out the hitmen, paid them. In Wendi's case, we're not sure if she went along with Donna/Charlie, or if she lobbied for the murder.

How much would you offer to reduce the Maestro's sentence? To 10 years, 20 years?