Probably because of - now deleted - test applications, the Median days until application decision plot at https://twl-test.wmflabs.org/dashboard/ shows a very high number for November, because the applications never had a decision. I think the solution would be to not include deleted applications here, if that is indeed the problem.
It's possible the problem is something else - we had a bug where date_closed wasn't getting set, so I had to just make up a date for the affected applications. I *think* I recall having set it so that it wouldn't disturb the median, but I may be misremembering. I may be able to recover a more accurate date_closed by grepping through the logs, but I don't think this is a high priority for my scant remaining time.