Salesforce CPQ to Agentforce Revenue Cloud migration

Hi Everyone, 

I would like to get some clarification on the best approach for migrating from Salesforce CPQ to Agentforce Revenue Cloud. 

Specifically, I’m trying to understand how the licensing and org setup work during the migration. If we migrate everything from our existing Salesforce CPQ solution to Revenue Cloud, would we need to continue paying for both the existing CPQ org/licenses and the new Revenue Cloud licenses during the transition, or would we only need to pay for the Revenue Cloud licenses? 

Also, how does Salesforce typically handle the transition period between CPQ and Revenue Cloud? Is there a recommended approach or migration strategy that allows us to avoid paying for both solutions for an extended period? 

If anyone has gone through a CPQ-to-Revenue Cloud migration or has experience with the licensing side of it, I would really appreciate your insights. 

Thanks.