The ideal amount of historical data for analysis depends on several factors:

• Volume of Records: Ideally, you should have hundreds or thousands of records (instances of the process being executed) to conduct meaningful analysis.
• Annual Cycles: To capture a full year's process, approximately 14 months' worth of history is recommended.
• Process Lifecycle Time: Consider the duration of your process lifecycle. For instance, if your sales cycle spans 12 months, aim to use 18 months of data for a comprehensive view. If a service ticket is typically resolved in one day, then three months' worth of ticket data should suffice if there's a significant volume.