Updates are removed on a regular basis to save on space. This should run automatically, but doesn't, so our head developer runs this job manually for the time being. Sometimes your updates may last longer than what is listed below, since our developer doesn't always run these jobs frequently

Each type of update gets removed after a different amount of time. These are the times for each one:

Journal updates that are more than 20 days old.
Comment updates more than 100 days old.
Art updates more than 20 days old.