1. Create a new file, e.g.delrecycle.sh
   Enter the following content to delrecycle.sh:

     #!/bin/sh 
     find /mnt/[MountPoint]/.recycle/* -atime +[Age] -exec rm -rf '{}' \;
     find /mnt/[MountPoint]/.recycle/ -depth -type d -empty -exec rmdir {} \;

1. Adjust [MountPoint] (mount point of your share) and [Age] (age of the files in days which you want to erase) to your environment and needs.
2. Upload delrecycle.sh to your share.
3. Create a cronjob (System|Advanced|Cron) with root– privileges, which calls the command:
   sh /path/to/MountPoint/delrecycle.sh