While it would be nice if companies edited reports immediately, that frequently doesn't happen. Many MSCs routinely take a week - 10 days to review reports. There are two companies I work with who sometimes take over a month, depending on the client. In that case, I am guessing that there is only one editor (or a particular team of reviewers) who reviews the reports for that client or on that project and the reports are simply stacked up waiting for them to get to them.
Ten days is longer than I've experienced with Measure. In the past, they have generally reviewed reports faster, but, based on the review time I see for other companies, I wouldn't say that's a long time.