You'll need to have a certain amount of feedback to receive a Job Success Score. More than 90% of freelancers have a score after 5 projects. Since not all projects and clients are equal, the length of time will vary. Nearly all freelancers have scores after completing eight projects. The projects need to be with at least three different clients and take place within a 24-month period. For more about Job Success Score feel free to check this help article.