While we would love to offer limitless trending reports through ReportBuilder, ensuring reliable and consistent performance from the service requires that we limit requests to 365 periods of time at any granularity. From the text in your submission, it sounds like you wish to view daily data for two years of time. There are two workarounds for this currently: you can split your request into two requests in ReportBuilder, or you can make the request using Data Extract or DataWarehouse. We are regularly reviewing opportunities to expand our reporting capabilities in the tool, but for now that limitation must remain in place.