When are files removed from the temp folder?

Files that are being uploaded by users are first placed in the uploads/temp/ directory, they will stay there until the user completes uploading a files and the file completion process is finished (zipping, encrypting etc.). If a user stops their upload while uploading or leaves the website while uploading then the files are not immediately removed from the temp folder. Eventually after 12 hours the cron job will remove these files from the uploads/temp/ folder to free up space.