This inflorescence is about 11 inches with 4 open flowers and 1 bud still to open.
This particular plant is noticeably on the small side compared with other plants of the same grex at Pine Ridge's greenhouse. I am guessing it suffered a setback from a recent repotting as the newer leaves are much smaller than the older ones. Many other plants of the same grex had 18 inch inflorescences with larger flowers, so I expect the inflorescence size and flower count will increase as the plant gets larger.