I have the exact same issue, and none of the responses solved the issue. I marked the estimates complete, the entire estimate is billed, and the job is closed, but still shows up on my report, which now has over 9,000+ lines and takes over an hour to populate. We use this report for monthly progress billing because it's the most accurate, but it so long because jobs with 100% progress still show up on the report. Below is a screen clip of the oldest project on my report, it goes all the way back to 2007.