Generating the report doesn't take long. What takes the time is finding those 10 transactions with 5 stars. If you use 10 and it doesn't show 5 stars, you have to scrap that 10 because you don't know which one was dodgy. The numbers also expire after about 14 months from sale, so then you have to go and find a new 10. I check every feedback before leaving feedback for the buyer.